I was originally searching for the looks of a 4D plane but wasn't much 
of a success, but I found this:
http://www.4d-screen.de/related-space/intro00.htm?/related-space/4d-space/4d-plane.htm

and it has 5D, 6D and 7D planes, very weird and interesting.

Another kind of cool 4D :-D 
http://www.youtube.com/watch?v=ioEDKwc3yp4&feature=player_embedded

Cheers.

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