Speculative Biology of Euclydians (and Bill Cipher) part 2
Part 1, Part 3, Part 4, UPDATE, Part 5
So this part is what you've all been waiting for, it took so long, but you'll quickly understand why. This part is:
The Biology of Bill Cipher
As always, this analysis is based on two assumptions:
Before Bill Cipher became a demigod, he was a biological, living organism and so were the rest of his species.
Even after Bill Cipher became a demigod, he still retained some physical characteristics of his biological form.
And a fair content warning: This contains anatomy illustrations. This isn't anything gory, but there are people who are squeamish, so you've been warned.
Click on the images to get better quality!
And without further ado, let's begin.
Euclydians are animals with a very specific shape. They have a shell in a form of a geometric shape and four limbs. Bill is an equilateral triangle, so my analysis will be just on triangular Euclydeans.
They have bilateral symmetry. This type of symmetry is characterized by having a left and a right side placed like mirror images of each other. Humans and majority of Earth’s animals also have this feature.
Bilaterally symmetrical organisms usually have a distinct head region, because of a process known as cephalization. This process moves the animal’s brain and sensory organs towards one end of the body – the head. Euclydians have a head. It’s the “tip of the pyramid” on Bill and that’s where the eye and other sensory organs and brain are located.
Finally, Euclydeans are segmented. Their segments are clearly visible as those weird brick lines on their body. Bill also often separates his body into three segments. This is a part of his god powers, but it tells us that Euclydeans have three major body segments, I’ll call them the tip, the middle and the base. Each segment contains specific organs.
Euclydeans are invertebrates. And yes, I know this image exists, but this is just Bill’s trolling. He’s making fun of human classrooms where we often find skeleton models. That skeleton wouldn’t even be functional, because it doesn’t have any joints in arms and legs, so it wouldn’t be able to move. And it has a hole where the brain would be, so you know, the fucking brain would fall out.
It was outright stated that Bill has an exoskeleton. Having both external and internal skeleton would be a big waste because you have two systems that do the same thing. Besides, the way Bill's limbs move is much more similar to an invertebrate. His shell is also somewhat bendable which would not be possible if it was made of bone. And the eye-mouth complex that Bill uses to eat would also be completely impossible with a set of vertebrate jaws.
Euclydean shell (or exoskeleton) is nothing like anything here on Earth. It’s most likely made out of silica combined with proteins. I say this because Bill turned to stone when he died and he also likes to eat glass, which is pure silica.
The exoskeleton is made out of several parts. It has a front (ventral) and back (dorsal) part. Both the front and the back part of the exoskeleton are made out of head region (the tip) and three layers of “bricks” which are just segments of the exoskeleton.
The front tip is probably made of more protein and elastic tissue than the back, because Bill has a very expressive “face”. This means that he also has quite complex facial muscles. The back of the head is probably the hardest part of the exoskeleton because it protects the brain. Bricks are in the middle since they have a very important role in speaking and breathing, but also allow the shell to bend.
Can Euclydeans change color, or is it just Bill Cipher using his god powers? Well, since he changes his color on instinct, I think they could! Bill can change color to black, yellow, red and blue. This means that he has a complex system of chromatophores – cells that contain little sacs full of pigment. When the sacs inflate, the body appears to be the color of the largest sac, whilst those deflated are invisible. Color changes depending on the pigments contained in inflated sacs. In Bill, the pigments are red, blue and yellow. Yellow is the standard color, it signifies neutral or content emotional state. He turns red when he's angry or wants to look intimidating and blue might signify fear, despair and cry for help. Black is the color of Euclydean’s skin, so when they look black, it’s because all pigment sacs have deflated and the transparent shell allows us to see the skin underneath.
And yes, Euclydeans have black skin. I know some people say that Bill wears thigh high boots and long gloves, but to me, that doesn’t make any sense. Like, that image of him in Theraprism is showing him with clothes over his supposed gloves and boots. Why would they make him wear sneakers over boots? And why baby Bill has yellow hands? Well, that’s something I’ll tell you in the next part where I’ll talk about babies.
Anyways, the skin is black, but we have no idea what it feels like. Seriously, so many people shook hands with Bill and nobody wrote down how his skin feels like! But we know that he has fingerprints. That means that he has very sensitive fingertips and that those little paws were made for grabbing things. Also, Bill doesn’t have any growths on his skin: no nails, hairs, scales etc. I know a lot of people love to draw Bill with claws, but he doesn’t have claws, not even in his most eldritch form. His fingers always remain small and soft. The legs have no fingers and the skin of the sole of their feet is probably thick.
Coelom is one of the most important organs, that you probably don’t know you even have! It’s a fluid filled cavity whose role is to separate internal organs from the muscles of the body wall. This allows organs to move and grow independently of your muscles and it also protects and cushions them against impact. In humans coelom is complex and it’s made out of pericardial cavity (around the heart – allows heart to pump blood), pleural cavity (around lungs – allows lungs to expand while breathing) and peritoneal cavity (around digestive system – allows for expansion and movement of digestive organs).
I believe that Euclydeans also have some form of a coelom. Coelom is even more important in invertebrates, as that’s where their immune system is and it can also serve as a supportive hydroskeleton. Since Euclydeans have a hard shell, they need the protection around their organs. Every shelled animal on Earth has coelom for that reason. They also need room for the food they eat, since the shell can’t expand and their limbs can enter the shell, so they need room for that too.
Euclydeans have a vast range of emotions, capability to communicate using speech, body language and even color shifting. They are as intelligent, or more intelligent than humans. They have a highly developed eye and other senses and all of this requires a nervous system. We saw Bill’s optic nerve when his eye got pulled out during Weirdmageddon, so he does have a nervous system, but I can't tell you how exactly it looks like.
There’s one part of Bill that I bet is similar to human - it’s his brain. Bill claims that he can take control over any being a long as they have neurons. This is his god like power, but then, why just beings with neurons? Well, most likely, because he has neurons too and kind of understands how they work. Maybe his brain even produces similar neurotransmitters as ours, so we’re easy to control with them. The brain is in the tip of the pyramid, slightly above eye and it likely has a lot of neurons and a very complex structure. I can’t tell you how exactly is his brain organized, but since he's bilaterally symmetrical, it’s very likely that it has hemispheres. He likely also has two neural cords, like most invertebrates, and those run down the dorsal (back) side of his body
Euclydeans have camera lens type eyes. Now here I can only speak of Bill, since we haven’t seen any other Euclydian. Bill’s eye is large, placed in the center of his “face”. It has eyelids with “eyelashes” (more on them later) and produces tears (Bill cries after his break up with Ford). The pupil is slit and vertical and there is no iris. However, there are muscles that can change the shape and dilation of the pupil. The eye looks similar enough to human that I can confidently say that he has cornea, lens and sclera. The eye is filled with refractory fluid and has some form of retina in the back. Bill’s eye changing color and being used as a projector or to shoot lasers are all parts of his god powers, however, it is possible that his species has a tapetum lucidum, a reflective layer of cells which help animals see in low light conditions and also makes the eye glow in the dark. Bill has color vision and he claims that he can see every part of the electromagnetic spectrum, but I think that's a part of his god powers. However, Euclydeans definitely could see in color, since their alphabet was basically a color code and they also use colors to express emotion.
Since Bill has fingerprints, we can confidently say that his fingers are the most sensitive part of his skin. Bill can feel through his shell too, just like every shelled organism ever (that's why he used Ford as a backscratcher). Tactile senses are very primitive, so Eucliydeans could feel cold, heat, pain, pressure, vibration and everything else just like we do.
Bill has a sense of smell and he even says which scents he finds attractive. This could mean that sense of smell plays a big role in reproduction of Euclydeans, but where is it located? Well, on the eyelashes. Except, those are not eyelashes, they are antennae. Bill has total eight of these antennae, 4 on lower and 4 on upper eyelid. They are very soft and sensitive, so he can retract them inside the eyelid. He does that when he feels threatened, so it’s probably a fight or flight response. His lashes get longer and he flutters his eyelid more near Ford, probably because he enjoys his smell. They are also located close to the mouth, so that’s how he samples the scents of the food.
Euclydeans have great hearing. They communicate vocally, sing, Bill can play the piano, so obviously, they hear. But I have no idea what they use to hear. It could be the bow tie, since it does look vaguely ear shaped, but it's possible that the bow tie isn't actually an organ. In that case, they could have an unknown structure inside them or they could just use their thin exoskeleton to catch sound vibrations.
They taste using their long tongue.
We have seen Bill’s muscles and they are striated skeletal muscles like mammals and insects have.
As the shell is kind of bendy, there is a lot of muscles underneath it. Those are the muscles of the body, they also move the face and bricks while speaking. The limbs have muscles too and two kinds at that.
When Ford shoots through Bill’s hat (which also a part of him) it is shown that inside of it are strange bone-like structures. These are not bones, since they aren’t articulated, but muscles do connect to them. They kind of remind me of echinoderm ossicles, but they don’t really look like them. This is another fully alien structure and I’ll call them anchors.
You know how Bill’s limbs can both bend just like human arms and legs, like he has elbows, wrists, knees and ankles, but they also bend like goofy rubber-hose cartoon anatomy? Well, that’s because there are two types of muscles in them. There are muscles attached to the anchor points and subcutaneous muscles.
Anchor points are located in the same places as joints in humans. Muscles that attach to them are long and strong and they are used for regulated, precise movement. The subcutaneous muscles (the one we see in his Weirdmageddon image) are used to bend the limbs in every other manner. They are not attached to anchors, but to the skin, so they resemble muscles of octopus arms. They are shorter and less strong, but when they act together they move the limbs in coils. These muscles are also responsible for squishing the limbs inside the shell when they are hidden.
Bill has incredible control and dexterity of his muscles, especially in arms and fingers. Even though his paws are soft and small, he can use them pretty much as efficiently as humans use their hands.
Possibly the strongest muscles in Bill's body are his jaw muscles, so let's talk about those jaws.
5. Eye-mouth complex and the digestive system
Having your eye used for feeding seems wild to us, but this adaptation is seemingly common in fictional geometric shaped people, as it has convergently evolved in Flatland’s inhabitants as well. And, speak what you like, but Euclydeans can’t choke on their food, so they have it better than humans.
I don’t know what Flatlanders eat, but Euclydeans are definitely predators. Now, I know that Bill sometimes depicts himself with human like teeth. The guy has a thing for teeth, especially molars, but he doesn’t have mammalian teeth. In every image where he opens his mouth that was not made by him, we see that he has cone shaped sharp teeth, like a predator. These teeth are great for biting and subduing prey, but they suck at chewing. Euclydeans can’t chew, so they they feed by swallowing chunks that they bite off, or swallowing their food whole if it’s small enough.
Here I depicted how this “eye-mouth complex” functions:
Euclydeans have a stomach in the middle of their body, but I have no idea what goes after it. My best guess is that they have a branching intestine. Our flattest organisms (flatworms, sea stars and brittle stars) all have this type of intestine. It basically means that, instead of just going like a tube, the intestine branches into different parts of the body. I also have no idea whether they have an anus and if it’s just one. This is just something I can’t tell you.
Since Euclydeans are capable of eating a lot of various things, I expect that they have accessory digestive glands (that’s liver and pancreas in humans). Strangely, despite the fact that his anatomy indicates a predator, Bill likes eating starch (pasta, empanadas, sandwiches etc). Most carnivores are unable to digest starch, so I went with god powers, but he ate sandwiches when he was a kid and had no god powers. So, we have two options. Either Euclydeans are omnivores (which, with those teeth, I doubt) or the animals on their planet store their excess calories as starch, not fat, so predators evolved the ability to digest it. If the second one is true, then Bill eating pasta is like your cat eating pure butter. It’s probably not healthy for him, but I don’t think he’s a guy who would give a single crap about that.
6. Breathing and speaking
In The Book of Bill, Bill says that “dumb trapezoids and rhombuses were sucking up his rightful oxygen”. This means that Euclydeans are aerobic organisms – they breathe oxygen. Their skin is dry, so they don't use it for breathing and they also speak, laugh and sing. All of this tells me that they have lungs.
I believe that their lungs are located near the base where the bricks are. The gaps between bricks have little tracheae that lead to the lungs. Bill most likely breathes in from his back side and breathes out from the front. The air is probably forced to travel through small crevices inside the lungs so that it can exchange the oxygen with blood. We don’t know whether Euclydeans exhale carbon dioxide, but they probably do, since they can eat our food, so they probably have similar metabolism to us Earthlings.
Since Euclydeans can speak and laugh, they probably have some kind of a diaphragm. In fact, I think they have two! Their voice has an echo, which means that, most likely, their lungs don’t always expel air at the same time. Air expelling causes the bricks to vibrate which produces sound. That’s why Bill seems to glow when he speaks – he’s actually vibrating. This action is also controlled by muscles. Depending on which row of bricks is vibrating and how many of them are involved, Bill changes the pitch and tone of his voice.
And the growling noise? Well, when Bill uses his demonic voice, he is doing one of two things. He is either using his god like powers to modify his voice, or that’s just how Euclydian vocal fry sounds. If you don’t know what vocal fry is, it’s produced when the vocal chords are vibrating slowly and they become out of sync. This produces a very specific sound and that sound can be made voluntarily. That’s how Mongolian throat singing works. Similarly, Euclydeans could slow down the rate at which their bricks vibrate and make them out of sync to produce that menacing “demon voice” as a threat display.
We know how Euclydean blood looks like. It’s silvery and kind of seems like it glitches. It also contain chemicals that can make humans sick. This means that Euclydeans have much different blood from animals on Earth, but it certainly serves the same function. It’s used to transport nutrients and oxygen through their body.
Since the agents from The Book of Bill were able to draw his blood, it’s clear that Bill has a circulatory system and a closed one at that. The closed circulatory system means that blood vessels end in capillary nets and don’t open inside the body cavity like they do in molluscs and insects. If the agents used syringe to pull Bill’s blood and he had an open circulatory system, they could actually collapse the entire thing as they would pull his organs as well. That’s why I believe that he has a closed circulatory system.
Closed circulatory system requires a heart and I believe that Bill’s heart is located between his lungs, like ours. I have no proof that his heart looked anything like in the illustration, but I looove cardiology, so I did all this just because I wanted to draw a weird heart. I don’t think Euclydeans have a super complex four chambered heart like we do, they most likely have two or three chambered heart. The heart separates lung and body circulation and regulates their blood pressure.
The capillary nets are all located in important places: lungs where they exchange oxygen, intestines where they absorb nutrients and brain where they feed the neurons. Euclydeans have a rather large brain, so it probably uses most of their calories and oxygen.
I can’t tell you anything abut Euclydean excretory system. I don’t know whether they produce urine or not, if they have kidneys, nephrocytes or something completely different. I genuinely have no idea.
They have to have an immune system because they are multicellular. Every single multicellular organism including sponges and plants has some form of an immune system. I believe Euclydeans have something similar to coelomocytes - a very common type of immune cells in invertebrates which reside in coelomatic cavity.
I'll talk about reproductive system in Part 3!
Are Euclydeans warm or cold-blooded?
This was a very tough one, because they could be both, but I am leaning more towards cold-blooded. They have very little muscle mass and heat is produced within the muscles via trembling or metabolic heat (heat released in various chemical reactions in the body). When an animal has very little muscle it isn’t used for that. Even mammals like sloths who have significantly reduced muscle mass become dependent on the surrounding temperature. Also, Euclydean flat shape can easily distribute heat they absorb, so they wouldn’t need to waste energy making their own. On top of that, Euclydeans don’t wear clothes, which can be a cultural thing, sure, but they could also not wear clothes because they need their skin exposed so that it could absorb heat.
Here's how Bill Cipher's complete inner anatomy looks like:
There, I hope you enjoyed this! I'll see you hopefully next week to tell you about Euclydean reproduction and development.
Thank you @ok1237 @unoriginal-starwalker and @chrystalitar for your support :D
(Also, I hid Ford Pines in one of the anatomy illustrations. Can you find him? Click on the images for better quality!)
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