Can you French kiss a spider?

If somebody asked you to draw a spider, how well would you do? I guess you would do the legs right, maybe even get the body parts in place – chest and head together as one blob, fat abdomen as another. But unless you’re a specialist, you won’t get the mouth right. Don’t worry though, by no means are you alone here. If there is one thing movie and game creators get consistently wrong about spiders and insects, it is how their mouths work. If nature was the way most people imagine it, it would be possible to French kiss a tarantula. Assuming you’re of the same size. And assuming it is consensual – which might be problematic, since courting is a tricky business in spiders.

Our view of nature is very mammal-centric. We judge the entire animal kingdom from the tiny county of cute furriness that wears a common face with one pair of eyes, soft nose and a mouth full of pointy white teeth. That mouth is surrounded by fleshy pouty lips and inside that mouth there is a wet soft tongue. If a creature doesn’t wear that face and boasts multiple eyes and some chitinous machinery instead of lips, it is a freak. Plain and simple. However, if we suspend our judgement and give our arachnophobia a good kick it deserves, we will discover the twisted road that led us to have a mouth we like, and the plethora of other designs a mouth can have.

Let’s start with us. How did we and our mammal kin happen to have all that white and pointy cuteness we show each other so often? While we’re not the only animals to have teeth, mammals have designed the hell out of them and made it their shtick. Other vertebrates, like reptiles, have rootless teeth that are usually the same no matter where in the mouth they happen to pop. On the other hand, ours have strong roots and serve different functions: molars crush, canines rip and incisors, well… incise. Some mammals lack one or several of these types, for instance horses don’t need to rip meat and therefore don’t have canines. These types aren’t interchangeable and have a fixed position in a jaw of a mammal, and of the three groups, molars are the most important one.

You see, a usual tooth of a vertebrate animal not only lacks roots, but also any kind of architecture and is essentially pyramid-shaped. Our grooved molars are the result of millions of years of evolution, with our ancestors in the Cretaceous and Jurassic periods trying out every possible shape from three-pronged ones to something that looks like an exploded pinecone. When the dust settled, we got our efficient groovy molars. The same way it took several centuries of gothic script for humans to finally settle on Times New Roman.

With the exception of teeth, our amphibian and reptile cousins share the basic elements of mouth design with us. It is pretty safe to conclude that you can definitely French kiss any reptile, conditions allowing. Maybe their lips aren’t that pouty, maybe their tongue is sometimes forked and sometimes is capable of reaching out and grasping a fly from air, but heh, giraffes have prehensile tongues too and can pick their noses with them (you should check the photos).

Things start looking weird though when we get to fish. Not only do some fish have teeth all over them (and I do mean all over them – we’ll get to it in a second), but they can even have multiple jaws – like moray eels, which use one jaw to grab the prey and another to move it further into their throat. What the hell is happening there? To get an answer to this question, we should rather ask “Why are we, mammals and reptiles, so disgustingly single jawed?”.

Our bony jaws have evolved from gill arches – the things that support gills in fish. That is because their initial function wasn’t that of food processing, but merely to force more air through. We don’t have gills, we use sophisticated machinery to pump air into our lungs, and so we’re basically left with what’s most efficient. Times New Roman of jaws. Our gill arches became our throat and – randomly – inner ear. In contrast, fish still have a full collection of them and aren’t afraid to modify some into an additional bear trap.

Keeping that in mind, how many tongues do you think a typical fish has? Can you French kiss a salmon? As it turns out, not exactly, since they don’t have tongues at all. Tongues evolved from the muscles that fish use to move their gills, and though fish might have found a use for a tongue, they don’t have muscles to spare to turn into it. Besides, when you’re in water, ingesting food is much easier – everything you eat is basically some kind of soup. Fish do, however, have a small fold at the floor of their mouth, but the only function of it that I am aware of is that it gets eaten by a crustacean parasite, that then itself acts like a tongue. You can definitely kiss that.

So basically the “true” tongue appears when our adventurous frog-like ancestors climbed out of the water. The “true” jaws precede them by a bunch, and appear once fish evolved enough gill arches to spare. So what did those pre-jaw guys look like? And – most importantly – did they have teeth? The short answer – more than you do. For originally teeth weren’t used for food processing. They weren’t even in the mouth. They were a type of scales, a plate armour.

Long before a trout invented its rainbow coating, a coat of teeth was the top of the pops. In fact, it is so good that some creatures have it still – you call them sharks. Shark scales are basically teeth; they are made of the same material called “dentin” and have pulp with blood vessels in the middle and a strong enamel coating on the outside, which makes them the perfect armour. It is exactly that ability to withstand harsh conditions that allowed teeth to find their way into our mouths – quite literally so. For millions of years they slowly migrated further and further inside the mouth, until they found their place on the gill arches, where they stuck ever since.

So… is that it? Does it mean, that any non-vertebrate animal doesn’t share anything common in terms of their mouth structure with us? Only a muscular hole at the top of their body and the fact that they put food into it? Well… How to put it… Not even that. Most animals have their mouth where we have our anus. Exactly. While you are bringing your gill arch from the floor, let me tell you this really quick: an animal is basically a piece of gut with some add-ons to make it happy.

The gut is the first thing an embryo develops. First it forms a closed gut inside itself, then it opens up to form a mouth. And in a lot of cases it stops there – quite a few animals poop from their mouth (and you thought that the image of French kissing a tarantula would be the most appalling part of this post, heh!). Most animals however go further and form a second opening on the other end and make in anus. Simple.

But we don’t like to be simple. We like to have tongues and complicated molars and other stuff. And we (animals with a spinal chord) basically perform a little developmental switcheroo on mouth and anus. It is slightly more complicated than that, but you got the idea. Only one group of animals does the same weird trick – Echinodermata, the group with starfish and sea urchins, and those guys are really weird. I mean like three nervous systems weird.

So, does it mean that you can’t French kiss a tarantula, cause not only does it not have tongue or lips, but you would be kissing what amounts to our anus, right? Well… ish. The issue is, whether you can call the structure that looks and acts as a tongue a tongue, or whether you call a tongue only that which evolved from the same tissue. If the former, then quite a few organisms would have tongues and teeth. Slugs even combine the two, and use tooth-riddled tongues to scrape food from stones, while guys like bobbit worms have huge teeth, so strong they can drag whole fish into their underground burrows.

And all of that explodes in terms of forms and flavours when it comes to arthropods and especially insects. Those guys have so many mouthparts we don’t have words for them and instead call them by number, like maxillipeds-1, maxillipeds-2 and so on. Most of those are actually legs that deformed and mutated through aeons of evolution to the point where whole conferences debate how exactly insect mouthparts evolved. In terms of mouth structures, no other group of animals can rival them. A telescopic grappler with teeth on it? They have it. A syringe? Check. A sucking pump? Check. A hose? Check. To illustrate the point, a honeybee’s mouth consists of: labrum, epipharynx, mandibles, maxillae (with maxillary palps, basically a sort of antennas) labium (with labial palps) and ligula which is – for all purposes – a tongue.

At the same time, unlike those of insects or crabs, the mouth of a spider is reasonably simple. It is a muscular hole with a single pairs of reduced maxillae, guarded by a pair of claw-like “chelicerae” and a couple of mini-legs, called “pedipalps“. They can be quite cute though (you should absolutely check out ogre-faced spiders).

So yes, in the end of this weird journey you can be reaffirmed in your opinion that under no conditions you would French kiss a tarantula. However, you can French kiss a honeybee. Only if it consents, obviously.


Physicalism and consciousness

A: You’re always banging on about “physicalism” and “physicalist monism”. Frankly it all sounds like “goo goo ga joob” to me…..

B: Monism is just the belief that there is only one kind of “stuff” in the universe, and physicalism is the belief that that stuff is physical stuff.

A: Right. But what about consciousness? That doesn’t seem very physical to me.

B: Fair enough, there is definitely a sense in which it will always seem like there is more than just the physical. As you say, the contents of our consciousness, our “qualia“, seem profoundly non-physical….and in a sense they are, but not in any sense that requires there to be more “stuff” than the physical.

But I agree – this question of how qualia can exist in a physical universe still needs to be dealt with, it’s a BIG question. You can say “they are just illusions”, and that’s true, but it doesn’t answer the question, it just dodges it. Illusions are things that aren’t what they seem, not things that don’t exist. No one can deny the existence of qualia, not even the most ardent behaviourist, not BF Skinner himself.

A: Uh huh… with it then please.

B: I’ll try. To be honest, I’m not sure anyone has really dealt with it yet, but the way we move forward with all tricky questions is to throw out conjectures which can be critically interrogated, both by others and ourselves. They can be interrogated experimentally, or purely through rational criticism. It’s all part of the process….

A: Righto, conjecture away.

B: We actually have plenty of examples of things that are real, physical phenomena, but seem not to be – rainbows, holograms etc. We also know about things that exist in different states – recordings of any kind, digital storage of information, etc. But any of these analogies can still only get you part of the way to consciousness, because these are things that are experienced, not things that experience.

From a physicalist perspective, consciousness is literally the experience of being part of the physical universe. That sounds like panpsychism….

A: Pan- what now….?

B: “Panpsychism” – the belief that consciousness is fundamental, and thus suffuses everything in the universe.

A: Is that like the Hindu concept of “Brahman”?

B: Something like that yes, I’m no expert on Hinduism, but I think that the concept of “oneness”, of an “ultimate reality”, can be either physicalist or “psychist”. Either way these are forms of monism, it’s just that the psychist form considers consciousness to be fundamental, and believes that the physical somehow emanates from that unified field of consciousness. Theoretical physicists also believe in a oneness and a “unified field”, quite literally – unified field theory is an attempt to unite all fundamental forces and particles in a single field…..which really is a pretty similar idea to Brahman, as I understand it, at least in monist forms of Hinduism.

A: Yeah, sounds kinda similar to me….physicists often use a sort of mystical terminology when they get excited too. They might even start talking about the “mind of God”, and then hastily point out that they mean the “God” of Spinoza, not some man in the sky…

B: Well, yeah, Spinoza was also a monist. Doesn’t he say something like “There is only one substance in the world, and that substance is God,”?

A: Sounds familiar, I never really paid attention in philosophy lectures to be honest – “talk talk talk drone drone drone yawn yawn yawn”. Anyway, get back to your droning about panpsychism, or whatever….

B: I’m not going to rise to that. Come to think of it, a panpsychist could probably either believe that consciousness is fundamental, or that the physical is but that all physical entities are imbued with consciousness, even fundamental particles.

A: Conscious particles?

B: Well, sort of. It’s a bit of a convoluted argument….

A: Can we skip it then?

B: I think it’s important, because it concerns a very deep divide in human thought. If you are a monist, you are committed to the idea that every fundamental building block of reality has a little bit of what it takes to make consciousness. For a physicalist that much should be uncontroversial, because we believe that consciousness is part of the physical universe along with everything else. The disagreement seems to be about whether we should call those building blocks “conscious”, or if we should reserve that term for organisms that are more obviously “aware”, but which are nevertheless built of those blocks. In some traditions, and I think this might apply to monist Hinduism, “consciousness” really seems to mean something like “that from which all other things are constructed”, so it’s sort of built into that definition that consciousness will always be fundamental, no matter what physics has to say….

A: Sheesh….do you ever wonder why people think that philosophy is all just arguing about the number of angels that can fit on a pinhead?

B: It’s true that a lot of the deepest schisms in philosophy are the result of semantic disagreements. But that doesn’t mean that they aren’t important, or that they don’t have a massive causal impact in our world – people will fight and die over their semantic distinctions, and they guide the way we think about and interact with the world in general. This is true of all of us, even scientists. Once we have the fairly basic philosophical insight that words are not entirely precise, and don’t really map onto reality in the same way for everybody, we develop this anxiety about the influence of words and try to escape it altogether. I think this is why some scientists claim philosophy is unimportant – because they think it’s “just” words, and words are unreliable as descriptions of reality. The thing is we can’t escape words – they have been central to human evolution and all our world views are necessarily built from them….which is exactly why philosophy is so important!!

A: Yep yep, off your high horse and on with the story please.

B: Personally, I’m no panpsychist. I feel there is every reason to believe that only very special parts of the physical universe, parts that perform a particular kind and rate of “information processing”, give rise to experience. And it’s not as if there’s this kind of information processing that just happens to give rise to experience, like it’s a coincidence or something. No, that’s epiphenomenalism, which is incoherent. There is…

A: Hang on, hang on….you and your “isms”….

B: “Epiphenomenalism” is the idea that consciousness is non-functional, that it’s just there, we’re experiencing it, but actually it has no influence on “reality”……whatever reality is supposed to be….

A: That sounds pretty stupid.

B: It is. There is an evolutionary context for consciousness. It’s not that our brains perform a particular kind of information processing and so we have experiences; it’s that our brains perform a particular kind of information processing because it gives rise to experience. Consciousness is functional. It is the solution to a design problem – that of how to integrate diverse sources of sensory input so that an organism can act effectively in the world. And consciousness is also about predicting the future…

A: Huh? Like clairvoyance? Now you sound like a mystic.

B: There’s nothing mystical about it, although it might be the source of some of our mystical beliefs. I can make it sound really dry if you want – consciousness is an “affordance-seeking predictive engine”.

A: Yeah, that’s dry. And boring. Stick to the mysticism, it’s more fun.

B: It’s not at all boring! It’s just a way of saying that consciousness allows us to imagine future scenarios, to envision the way the world around us is likely to change over a given time period, so that we can be best placed to either get the things we want, or avoid the things we don’t want to interact with, like predators or other hazards. When you stand on the edge of something tall, it’s not uncommon to have a vision of yourself falling off it – that’s one of the functions of consciousness, to warn us about dangerous things in our environment by predicting what might happen if we get too close…..

A: Hold on, how do you differ between “consciousness” and just “awareness”? Couldn’t I be aware of dangerous things in the environment without actually having visions of them, or without any kind of prediction of the future?

B: It’s difficult to disentangle awareness and consciousness in either an evolutionary context or in terms of the words themselves. I mean, to be “conscious” of something is to be aware of it, right? And if you consider human consciousness as some sort of end point of an evolutionary series that stretches all the way back to our distant single-celled ancestors, it’s going to be pretty hard to draw a line with consciousness on one side of it and “mere awareness” on the other side of it. Single-celled organisms are aware of their environments; they can sense them in a number of ways. Our consciousness, whatever it is, is descended from that awareness. I don’t really know to what extent the sensorium of an amoeba is integrated, but as organisms become more complex and their ability to sense the world becomes more refined, I imagine there is a greater need to integrate sensory inputs to create a unified picture of the world, and that is consciousness.

A: That sounds pretty straight-forward, but I’m not getting the “prediction” part, and I don’t get how all this leads to dreams and imagination and all the things that fill our consciousness and seem completely un-physical.

B: Yeah, it’s really hard to connect all those dots and articulate a simple explanation that really nails human consciousness. It’s hard to even do that for oneself, let alone put it into words that can give someone else that “Ah-ha!” moment…

A: Aw, life’s so hard to understand, isn’t it? Anyway, your “Ah-ha!” moments don’t mean you really understand, do they? They could just be the standard illusion of certainty everybody suffers from….

B: That’s very true. Regardless, I think it’s something like this: the integration of sensory inputs serves to create a sort of coherent “model” of the world, full of relevant affordances…

A: What are those again?

B: “Affordances” are basically things we can interact with. The thing is, the brain doesn’t create this model from scratch every moment of the day, that would be way too inefficient. It builds a model and then updates it only as new and unexpected things are detected. So the model is always a sort of expectation of how the world is going to be, which is only really updated whenever something that wasn’t included in that prediction occurs. That’s called “prediction error”. And since the brain has this capacity to actually build this integrated model based on sensory inputs, when those sensory inputs stop, the modelling capacity doesn’t just switch off. That’s essentially what dreams are – the brain continuing its task of model-building, but now unconstrained by sensory input. So really, the brain is always making predictions, and as predictive abilities become more sophisticated, organisms can benefit from anticipating potential future occurrences by ensuring they are in the right place at the right time to take advantage of, or avoid, anything that might come their way. When some organisms actually became “meta-aware”, of this…

A: What? You’re going off the deep-end now….

B: Aware of being aware. Like we are. Being aware of this predictive process means being able to control it to some degree, to actually plan for the future. But there’s a bit of a danger there I think, because obviously our predictions aren’t always accurate and a lot of our modern neuroses come from us doing too much predicting – we get caught up in our fantasies and can no longer tell which of the threats in our environment are actual, and which are the products of our own minds.

A: Right, like paranoia.

B: Exactly. It’s important for us to stop paying attention to that stuff from time to time, to take a break from all the self-generated predictive activity that usually fills up consciousness. It’s basically taking a break from our “selves” and directing our attention outwards and just enjoying the sensation of being a conscious part of the physical universe…..

A: That kinda makes sense, but now you’re starting to sound like a mystic of the self-help guru variety. I’m not sure I entirely got your explanation of consciousness as predictive though, and none of this is really convincing me about physicalism, either.

B: It’s a tough sell. Anyway, I’m tired, you’re tired – let’s talk about this again another time….



Painting by Genevieve Camille Jackson – Cadeau de la Terre-Mere (A gift from Mother Earth), 2017 Acrylic on canvas 100×80


Permanent Evolution Podcast Episode 2

Episode two of the Permanent Evolution Podcast.

Part 1 – Morals and the Louis C.K. case study; are we becoming more moral? is there progress in history?

Part 2 – Cultural evolution continued; can a complex world view be coherent?

Part 3 – Is reality coherent? Is “evolution” just another catch-all metaphor?


When Joha says “immoral”, it sometimes sounds like he’s saying “moral”……

Teleology is “goal-directed by knowledge”, as opposed to teleonomy – “goal-directed by law”.

All music and field-recordings/soundscapes by Tim.

Painting by Genevieve Jackson.

Evolution of a tentacled bottle

Evolution isn’t a scientific theory. In fact, it has no more to do with science than does a tree. Evolution is an observable reality, while science is just one of the tools to observe it. Unlucky for us though, it usually becomes apparent on a large streaks of time, so we have to connect the dots we observe. My personal favorite example of evolution at work is Cnidaria, the group of organisms of which you definitely know a couple, like jellyfish, sea anemone or corrals. There are some 10-000 species of cnidarians, and though quite diverse, they all share a couple of traits.

You see, some unfathomable 600 million years ago a lucky marine organism discovered two life hacks. First, that being a muscular bottle with tentacles at the opening is neat, second, that having venom-filled pneumatic harpoons on those tentacles is even neater. These two inventions, or apomorphies if you’re into jargon, propelled the evolution of cnidarians. All of them share the basic tentacled bottle body plan, and all of them use the same weaponry to sting their foes and prey. So what did they do with that? The short answer: everything.

First, lets start with the basics. The body plan of a tentacled bottle is called a polyp. A lot of cnidarians remain exactly that. A fresh-water Hydra being a great example. It sits on some algae and uses its tentacles to catch and bring prey to its mouth – the opening between the tentacles. If it needs to move, it stretches its body sideways, steps on its tentacled end, stretches again, steps on its bottom end, then tentacled end again and so on until it has arrived where it wanted to be. But a hydra is small, and quite simply built. Some solitary polyps go further and grow much larger, up to a meter in diameter, like Stichodactyla sea anemones. They are still essentially a tentacled bottle made of muscles, but there are way more tentacles and the inside has muscular cross-walls to account for their huge body. Being huge allows them to eat bigger prey, like fish. However, even that isn’t enough for them, so they have symbiotic algae that give them their vibrant colors.

Now, what if you don’t like to be alone? What if you like to hang around with some friends? Well, in that case you might want to try being a coral. A coral is a colony of polyps, that grow out of each other’s body. It probably evolved from cnidarians’ usual mean of reproduction, by just sprouting a new animal on the side of the body and then cutting it off to live a life of its own. Colonial polyps instead decide to stick together and hunt in pack, sharing their meals via connected guts. So instead of a simple muscular bottle, you have a branching one, like a nightmarish tree, with tentacles on every branch and a single giant stomach inside.

This coral idea proved to be so successful, that several groups of cnidarians have evolved it independently. Not only you can have more regular meals by relying on your buddies to catch some when you’re unlucky, but also you have more protection – by having other’s weaponry alongside yours (remember those venomous pneumatic harpoons?) and you can divide responsibilities. To realize how important that last one is we only have to look at the bombastic success of multicellularity, which only works because each cell is single-mindedly devoted to a single task, with different lineages busy with different tasks, like red blood cells distributing oxygen, bone cells making bones and neurons governing it all. In corals’ case though that manifests in some polyps specialising in hunting and growing long, armed tentacles to catch swimming prey, while others get rid of tentacles entirely and become larvae-producing factories.

But being large chunks of muscle – however well armed – usually isn’t the best idea. Venom can be tolerated and one only needs to have thick scales to protect oneself from harpoon stings. So you need armour. And boy cnidarians have evolved the hell out of it. There are two basic types of armour in animals. One is outside of you, another is inside. Evolving any of those usually means a great success. Thus, our bones allowed vertebrates to dominate the megafauna, while chitinous carapaces made insects’ the dominant group of land animals in their size. Well, the corals not only have evolved both, but they also tried as many versions of those as they could. Black corals have a thick rod inside their colony, and when threaten they flat themselves, so you have to try hard to scratch them out. Some other species prefer greater mobility and have small bits of skeleton distributed within their bodies akin to plate armour. Others build fortresses that their whole colony resides in, with each polyp having a small bastion of its own, that it can retract to in times of danger. These fortresses form the basis of the coral reefs. And yeah, all those skeletons are build of nothing else but calcium carbonate, the thing marble is made of, so breaking it is kinda difficult.

But what if you don’t like to be a sessile fortress? What if you like to be free and roam the oceans? Well, there are several options you can do exactly that while still being a tentacled bottle. The easiest solution is to become a jellyfish. All you need to do is flatten the bottle on the vertical axis, so that the sides become this big round fold, with the tentacles being on the rim of it. The thing you usually think of as jellyfish’s tentacles are in fact corners of its mouth, stretched that long to help with the movement and prey catching. What will probably come as a surprise to you, is that most jellyfish are tiny and only serve as a way for corals to disperse. That is right, some corals produce jellyfish, they swim around, mate, then settle down and become a new colony. The big jellyfish though are the opposite of this. Like harmless boreal Cyanea, a couple of meters in diameter with tentacles tens of meters long. They are produced by tiny corals, that form stacks of jellyfish plates, which separate one by one and begin their life. And obviously some jellyfish got rid of the polyp generation altogether and produce larvae that become a small jellyfish straightaway.

I hope by this point you’ve already got the idea that if something is possible, cnidarians have evolved it. So learning that they have eyes (called rhopaliums) won’t shock you. Or that they are good at regeneration, to the point that some of them reproduce mainly by leaving traces of flesh on their path, that turns into new polyps. Or that some jellyfish never swim at all, but sit on the bottom of the ocean with their tentacles up and filter water through small holes their mouths have evolved into. Or that they are so big on symbiotic algae, that most of the coral colours come from that and they can’t really survive without food that the algae produces for them, so when the algae leave the coral – which manifests in a reef bleaching – the corals die soon after. All good? OK, then, time to talk about Portuguese man o’war.

This little animal, also called blue bottle jellyfish, isn’t a jellyfish at all, but a floating colony of polyps. But here’s the twist. The members of the colony evolved to a point when their individuality is completely lost. Other corals usually can have as many members of the colony as they wish, and you can tell individuals apart by their tentacle-surrounded mouths. Not the case with man o’war. Those guys completely merged to create a superorganism, with some becoming a bubble that acts both as a buoy and a sail, some forming reproductive organs, some being nothing more than a long tentacle, riddled with batteries of venomous harpoons, some – nothing more than propulsion pumps. This animal is truly a new step in colonial polyp structure, akin to the change from a single cell to a multicellular organism. But at its basis lies the same principle – muscular bottle with harpoon-armed tentacles.

This brief introduction into the amazing world of cnidarians should illustrate one important point about how evolution works. When a group of animals stumbles upon an invention, that makes their life so much easier (multicellularity, spinal cord, legs, chitinous carapace), they then explore this invention to the very bottom and do all kinds of crazy stuff with it. Sometimes they will even lose all other traits and organs, but those “core” ones, to squeeze into ways of living no other can have access to. For life isn’t just made of water, it acts like water and will – with enough time – enter all the niche crevices and spaces there’s access to.

Permanent evolution podcast, episode 1

The first episode of Sympathetic People’s new podcast is now streaming on SoundCloud.

*Explicit language warning*

Major topics of discussion:

The “social justice movement” – Part 1

Music, exercise, self-improvement – Part 2

Alchemy, the deepest schisms in philosophy are semantics, consciousness – Part 3

All music by Tim, except for the intro and outro to part 3 – guitar by Tim, keyboard by Nick Jackson.


Tim was tired and confused. Károly* Kerényi is the historian who wrote with Jung and Ram Dass is NOT Ralph MetzNer (duh.)

Permanent Evolution

Permanent evolution

A: What is “evolution”?

B: Evolution is descent with modification.

A: Oh? As simple as that? So……can we go home now?

B: Slow down – sometimes simple explanations are the hardest to understand – so let me unpack this one a bit.

Evolution is the ubiquitous process through which all that was came to be all that is, and through which all that is will become all that will be. That might seem cryptic or hand-wavy, but it’s just a simple statement. Evolution is prosaic.

Evolution is not “natural selection”. Natural selection is not a “type” of evolution. Natural selection is a particular kind of constraint that shapes the consequences of evolution in biological systems. It is not the only kind of constraint that shapes biological evolution, but it’s an important one. Natural selection is one of the best ideas ever produced by hairless apes, because it explains why some of the results of evolution look the way they do (to us).

Evolution is just descent with modification. The future states of a system depend upon (are descended from) prior states. Systems (ones that are actual) are not static – future states are different from prior states. That is evolution: breathtakingly simple and utterly universal.

There are those that wish to defend the word “evolution” from this interpretation, as though it might be tarnished by it. “Following this argument,” they (might) say, “the weathering of a rock, its transformation from a boulder into sand, would be considered its ‘evolution’.” Indeed. As would the transformation of the sand back into rock, were that the sand’s fate. I repeat: evolution is prosaic.

“Change is the only constant.” A truism that happens to be true. Aristotle thought that the default state for all things was for them to be at rest. He thought energy had to enter a system in order for movement to be initiated. He used this logic to construct his “prime mover”, or “unmoved mover”, argument. Aristotle was wrong. Heraclitus (a precursor of Aristotle) was closer when he said “everything is in flux and nothing is at rest”. Modern physics refutes Aristotle’s argument – at the “bottom” all is change, all is movement. In fact, Aristotle had it precisely backwards – “energy” is required to prevent change, not to cause it, and even then it’s just a temporary preservation of some “pattern” or another. “All patterns are ephemeral!”, cries the evolutionist.

A: A bit morbid, these evolutionists…

B: Death and taxes, my friend.

Anyway, change is constant, but not all change is permissible, because future states descend from prior states. Future states are constrained by prior states. Evolution, as manifest in the actual universe, is a process that takes place across time. Yes my dear, time is real! The past constrains the future and the deepest level at which we can observe this is by considering the laws of physics themselves. Since evolution is a process in time, if evolution is ubiquitous time must be fundamental and the laws of physics therefore cannot be “outside time”. Lee Smolin hits the nail on the noggin: the laws of physics evolved. Once evolved, they constrained all future evolution. They are one of the earliest “selection pressures”.

A: Why don’t the laws of physics keep evolving then?

B: Huh? I dunno….maybe they do, but maybe they are heavily constrained by something else. I didn’t claim to know everything…..and I was on a roll, do you have to keep interrupting?

A: Sorry….

B: That’s OK, it was a good question. Anyway, let me sum this up so we can get on with our lives.

Evolution is like this: change is constant, but every system has a set of degrees of freedom which constrain its possible future states. These are the selection pressures or “principles of selection”, or whatever semantically isomorphic phrase one wishes to coin. Different systems….

A: Semantically what?

B: “Semantically isomorphic” – it just means a different choice of words with the same meaning.

A: Well why didn’t you just say that?

B: I think my facial expression says it all right now. Aaaaaanyway:

Different systems have different principles of selection (and working these out is the hard, explanatory task of the evolutionary sciences). Selection pressures themselves evolve, of course, and the laws of physics are an example. The biological sciences have identified thousands of examples, some of which constitute “natural selection”. Systems of ethics are another example – they evolved and they constrain future evolution.

Got it?

A: Sorry what? I was just checking my Instagram feed…

B: Ah. Fair enough I guess. Have you ever read any Marx?

A: Huh? I thought we were done with all this intellectualising once you got through the evolution schtick?

B: We are, but this is funny – one of Marx’s most famous slogans was “permanent revolution!”; little did he know that reality was in a state of permanent evolution!

A: That’s not funny.

B: Oh.