Tesseract - Wikipedia, the free encyclopedia

Yes, what about it?<p>If you're interested in 4D you might enjoy <a href="http://www.superliminal.com/cube/cube.htm" rel="nofollow">http://www.superliminal.com/cube/cube.htm</a> (requires Java)

No mention of Madeleine L'Engle's "A Wrinkle in Time"?