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Shadow of a tesseract
A hypercube is a regular solid in four or more dimensions.

A 4-dimensional hypercube, or 4-cube, or tesseract has "faces" that are regular 3-dimensional cubes. A 5-cube has faces that are 4-cubes. In general, an n-cube has faces consisting of (n-1)-cubes.

It is also the sub-title of the second movie in the 'Cube' series, it may well be built on an interesting premise but is very poorly executed. And therefore rubbish.