In an ordinary three-dimensional world you can not find four-dimensional objects, but you can see them on this YouTube channel. Regular viewing of the mysterious four-dimensional figures is a good brain training. And some people say that as the result of this traning they can understand four-dimensional hyperspace. For anyone first learning about 4D and higher spaces, it is helpful to keep in mind that the four-dimensional space just adds one number to the three ordinary dimensions - length (often labeled x), width (y), and depth (z). The fourth dimension seems like a fantastic, but higher dimensional spaces have become one of the foundations for formally expressing modern mathematics and physics. Large parts of these topics could not exist in their current forms without the use of such spaces.
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