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Quanta Magazine@quantamagazine.bsky.social |
To visualize a 4D shape, we can build up to it. Just as a square in two dimensions is bounded by four one-dimensional line segments, and a three-dimensional cube is bounded by six squares, the boundary of a tesseract — a four-dimensional cube — is defined by 8 three-dimensional cubes. |
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Quanta Magazine
@quantamagazine.bsky.social
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We can get some intuition for what a tesseract looks like by unfolding its three-dimensional boundary to obtain its eight boundary cubes. |
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@progressivepeter.bsky.social
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And of course, you can consider physical 3-D space + time (4D spacetime) to get a feel for 4D thingies.
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