It's a 2D representation of a 4D shape - the lines to represent it are 2D, but it is non-the-less a 4D shape being represented. The way I saw it was more like a hyper-rectagular-prism, but it's like two rectangular prisms with corresponding vertecies attached with another line, across the fourth dimension.
It makes sense, even if you can't visualise it.
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Now complete with XBL gamertag for your pwning convenience.
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