It's hard to describe the book or assign it to a category. Let me give you two quotes from the book.
Mathematicians always strive to confuse their audiences; where there is no confusion there is no prestige.
All numbers are interesting, since the first uninteresting number would be interesting.If you like mathematics and you are ready for some light reading while giving the impression you are reading really hard stuff then this book might be for you.
Mathematics made difficult
A handbook for the perplexed
Carl E. Linderholm
Out of print - but download-able ;-)
( Unbelievable it is out of print in the age of Kindle, iPad and what have you. )