At first, I thought 'what a sham, they just stretched a cube to make it seem to go into a new dimension, it's still actually just 3-d.' Then I realized, 'no it's actually still just 2 dimensional, as the third is an optical illusion, or perhaps symbolism of depth.' In that sense, stretching the cube of course doesn't make it an actual 4 dimensional object, but with the 4th dimension being time it makes as much sense to let that final stretching represent motion in time as it does to to let the previous one represent motion into a 3-dimensional space.
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