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The IdeaHow is a fourdimensional maze possible?The actual world we live in has three dimensions of space plus one of time, so people often refer to time as the fourth dimension, but I am not talking about a maze that extends over time. In fact, I am not even talking about the actual world we live in! I am imagining a different world, one that has four dimensions of space (plus one of time). In that world, you can build fourdimensional mazes, just as you can build threedimensional ones here. How can you see a fourdimensional maze? As a threedimensional person, you see the world by having it projected onto a twodimensional retina, i.e., by receiving a twodimensional set of colors. Similarly, a fourdimensional person would see the world by having it projected onto a threedimensional retina. It is difficult to display a threedimensional set of colors on a twodimensional computer screen, so I decided to consider black to be transparent and arrange for most of the world to be black. That reduced the original solid block of color to a set of threedimensional lines. Then I created a threedimensional vector display using stereo pairs of images. Thus, it is possible to observe the fourdimensional maze world exactly as if you had one fourdimensional eye.

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