Rotating Cube in 4D

Mike showed me an interesting picture that he found at some math site that shows the stereographic projection of a rotating four dimensional cube onto a three dimensional hyperplane. Imagine the cube as a wire frame in three dimensions. The picture you see on the screen is an additional projection onto a two-dimensional plane. This is relevant because it shows how time can be cyclical. (The 4th dimension is time) For everyone who wonder how the universe can exist without a beginning or end, you may find this of interest as well.