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Shapes which have 4 spatial dimensions. It's really hard to visualize these, because our brains are set up to perceive only 3 spatial dimensions.

Some theories of physics posit that the universe we live in actually has ten or so spatial dimensions, but we can't perceive the others because they're "curled up small" ... one analogy is a tightrope. A tightrope walker really only has freedom of movement in one direction (forward or backward). However, an ant on the tightrope is small enough to perceive the side-to-side dimension of the tightrope and move in two directions, forward/back and left or right. The left and right directions are "curled up small" (they go around the rope, so a human trying to walk on the rope can't really use them).

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12y ago

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Q: What are four dimensional shapes?
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