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In its simplest definition, a tesseract (or “hypercube”) is the 3-dimensional shadow of a cube in the fourth dimension.

You and I can only consciously perceive 3 dimensions (consisting of height, length and width) with our senses, but mathematics and physics shows us that there are many possible dimensions. Four dimensions are required to explain how gravity works. Theoretical 4-D structures can be plotted on 4 axes: x, y, z and t where t=time. Physicists call this fourth dimension space-time.

I can’t remember the first time I became aware of the concept of a tesseract. It was probably after reading Robert Heinlein’s novel Have Spacesuit, Will Travel (the best science […]