http://www.chapters.indigo.ca/item.asp?Item=978046502656&Catalog=Books&N=35&Lang=en&Section=books&zxac=1

The relationships between art and math are not always apparent. That is, until you read Douglas Hofstadter's brilliant, Pulitzer prize-winning Godel Escher Bach. It explores the patterns and symbols in the thinking of mathematician Kurt Godel, artist M.C. Escher and composer Johann Sebastian Bach. Hofstadter explores the links between formal systems. This 20th anniversary edition will delight, inform and entertain all readers.

Brilliant book.  Hurts my head each time I read it.  Read this book.