From the Daily Grail: Carl Sagan: "Depth Perception"

Daily Grail editor and writer Greg Taylor has a good post, with video clip of Sagan, on Sagan's explanation of other dimensions and a demonstration of "flatland." Depth Perception.
Taylor comments, in referring to Edwin Abbott's 1884 book Flatland:

Flatland, in my opinion, offers a very good reason why investigation of anomalies is a valid exercise. Certainly, it demands the use of rigorous and honest scientific research; but also it requires an open mind and the willingness to speculate wildly at times.

Also included: quotes from Michio Kaku.