Flatland: A Romance of Many Dimensions. This is the story of a world with only two dimensions, called flatland. It's very hard for the people living there to imagine a world with three dimensions like we live in. This is a story about ourselves and about how we lack the imagination to see something bigger than our own small world. This highly imaginative book is now available in a high quality PDF format with the author's original drawings. Free.
Mac PPC/Any Mac OS/Mac 68k/Mac OS X/Any Linux Distribution/95/98/Me/NT/2000/XP/2003