Description Hypercube
Here you can see a 4-dimensional cube (also called a tesseract) as well as its 2-dimensional representation on a likewise 2-dimensional shirt.
Math freaks know, of course, that this is not quite possible - Any attempt to represent a 4D hypercube on a 2D surface fundamentally fails. At best, pseudo-like projections are possible, giving a small impression of its complexity. At least the representation on this shirt correctly shows the number of vertices, edges, and faces ;-)
By the way, the formula indicates how many m-dimensional structures can be found on the edge of an n-dimensional cube.
You can also read more about hypercubes here.
The Hypercube Shirt is just the right thing for true math freaks who like to show what they are and are not tired of answering puzzled questions from the uninformed about their shirt motifs.