> > [...]
> Another fun book to read on the subject of dimensions (and I
> believe this was mentioned in Rucker's book too) is "Flatland" by Edwin A.
> Abbott (check the spelling of the last name). It doesn't deal directly
> with the fourth dimension, but presents a very fun and lively debate on
> the problems and wonders of discovering higher dimensions, through the
> eyes of a character named a^2.
Check out Michio Kaku's "Hyperspace" as well. A fragment of "Flatland"
can be found in "The World of Mathematics", James R. Newman (ed.), Tempus.