I heard about this book
from a friend of mine while in Slovakia. We (being the nerds
we are) were talking about different dimensions while on a
train. Of course everyone knows that is what you talk about
while on a train. This book is a story about a two
dimensional being (A. Square) and his encounter with a three
dimensional being (a sphere). It is a really good insight
into modern mathematics and will make you stretch your mind.
Low and be hold there is a free copy of it right here!