In Zaman's case, he and his colleagues found a way of 3D-printing material divided into chunky, square-shaped tiles. The angles of the sides of those tiles, and the precise nature of the cuts that separate them mean that, when squeezed together, they pop up into a desired 3D shape. It could be a chair, a tent-like structure, or a curved container of some kind, for instance.
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(This is where the famous “but first, we will need to talk about parallel universes” quote comes from. In the SM64 community, covering spaces are known as “parallel universes”). Wheather intentional (like in Pacman) or unintentional (like in Super Mario 64, due to casting floating point numbers to short ints), it is often the case that walking in a straight line long enough will eventually lead you back to the same point.
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