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Even this would require visualization on their part beyond any of their experience or conceptual skills. It is just as difficult for us to visualize a four-dimensional object within our three-dimensional space. An example of such an object is a hyper-cube, a "cube" in four (mutually orthogonal) dimensions. It takes very special skills to deal with such an object. However, just as a three-dimensional cube can be rendered into an "unfolded" version on flat two-dimensional surface, the four-dimensional hypercube can likewise be represented in three dimensions. These "unraveled" hypercubes are called Hinton cubes, or tesseracts. 54