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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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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A cube in our world, if we treat time as a fourth spatial dimension, is not a 4d cube. It would be more like a long, wiggly extrusion with a square cross section.

A true 4d cube would appear from nothingness, exist stationary for its side length, and then disappear just as suddenly. This requires a unit conversion between length and distance, which cannot be properly done because time is not a spacial dimension.

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