The Number Devil by Hans Magnus Enzensberger
Interesting book. I've been muddling through this one with the girls. I think they may be a bit too young for it. But then again, maybe it's just not their style. My 7yo just breezed through it and loved it! But he's always been fascinated with numbers.
If you have a number-guy (or girl) in the family, let 'em have it!
If you're trying to inspire math - - wait to introduce this until they're a bit older (middle school grades).
If you want to be inspired, read it.
OR if you want to take a new approach to math, use this one for sure. Just read it slowly....like, 1 chapter a month for a year and really explore the concepts.