Why is the “Fourth Dimensional” representation of a cube a tesseract? If time is a dimension shouldn’t the higher dimensional representation of an object be it’s worldline/timeline?
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It is for both. The 3D cross sections of a tesseract are cubes, so one way to view it would be to have a cube for the length of time equivalent to the length of the sides of the cube (which in itself makes little to no sense, but a simple velocity of the viewer compared to the tesseract through these cross sections can return sense).
Cross sections aren’t always the most helpful, though, so other ways of bringing it down in dimensions can be helpful, such as shadows
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