Tesseract - Wikipedia, the free encyclopedia
en.wikipedia.orgYes, what about it?
If you're interested in 4D you might enjoy http://www.superliminal.com/cube/cube.htm (requires Java)
No mention of Madeleine L'Engle's "A Wrinkle in Time"?
I also remember a short story about a guy who builds his house using a tesseract as the model. More inside than outside--- until it collapsed! :)