Mathematicians create videos that help in visualizing four-dimensional objects. Science News writes about it: seeing in four dimensions.
posted by Surfin' Bird on Aug 24, 2008 - 26 comments

What the World May Come To. "THE school books tell us that the earth is a round globe, or, to be more exact, an oblate spheroid - a ball with the ends slightly flattened, as in an orange. This is, of course, true of the general appearance of the earth as it might be viewed from the moon or from Mars, and we may see it proved more or less by watching the earth's shadow on the lunar surface during an eclipse of the moon. But the earth is slowly but surely changing its shape, and already it is in process of becoming a tetraedron, or a pyramid." (Via Incoming Signals, which quite properly calls the author "sort of the Time Cube guy of the World War One era.")
posted by languagehat on Jan 17, 2005 - 20 comments