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Video of cube passing through hole in equally sized cube
https://youtu.be/-2jjgHsxEu4If you have two cubes of equal size, it's possible to cut a hole in one cube that's large enough for the other cube to pass through it.
From Wikipedia:
In geometry, Prince Rupert's cube (named after Prince Rupert of the Rhine) is the largest cube that can pass through a hole cut through a unit cube, i.e. through a cube whose sides have length 1, without splitting the cube into two pieces. Its side length is approximately 6% larger than that of the unit cube through which it passes. The problem of finding the largest square that lies entirely within a unit cube is closely related, and has the same solution.
The original proposition posed by Prince Rupert of the Rhine was that a cube could be passed through a hole made in another cube of the same size without splitting the cube into two pieces.
Image: Wikipedia/Acf6
Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/2FmV7PI9wSw/video-of-cube-passing-through.html