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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