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(Made in Blender) Alrighty, that should be the last of these 4D shape animations for now! (Unless I find myself trying to make all the like, 4D torus-like shapes, though that might be a bit much work to make something I'm happy with sldfkjhgsf) These two shapes are duocylinders (or well, low-poly duocylinders—they're technically 8-8 duoprisms)! I'd give an analogy to a 3D shape, but honestly as I understand it there just, isn't a good analogous shape in 3D? It's because these are made by wrapping two cylinders around each other, making both of them into closed loops, but that's just not something you can do in 3D! It's sorta like making a cylinder by taking a rectangular piece of paper and connecting the ends together into a loop, but instead of a rectangle you have cylinders, and because you have 4 dimensions to work with you can close both of them up into loops! (It sorta reminds me of the shape on a tennis ball or baseball (or even a basketball I think?), where the two halves come together and it's sorta like they're wrapping around each other. You can actually even see those sorts of shapes in this animation, when the duocylinder is projected down into 3D! Which I think is neat) The fact that both its sides are made by wrapping cylinders together into loops also means that both its sides are curved! Unfortunately, my understanding is that each side is only able to roll in one direction, so if you set one of these shapes on the ground, it'll only be able to roll back and forth one way, and you'd need to pick it up and flip it around in order to be able to roll it some other way. (I could be wrong though, I'll admit I haven't approached the topic very rigorously.) However, since both sides are curved, that also means that however it's set on the ground, it's always able to roll in some direction! This is in contrast to shapes like the spherinder and cubinder, which both have at least a couple of flat sides they can rest on. (This is even true of a 3D cylinder!) I think that's neat!
