One sun, two parents, three meals a day, four seasons, five fingers … every child soon discovers that lots of things in life have an inherent number attached to them. Just as five individual fingers become something much more important and powerful when combined together in a hand, these numbers are often much more than a simple addition of their parts: they are intrinsically connected to the object, expressing a particular quality. In this readable little book, Wolfgang Held explores the fascinating qualities of numbers one to thirty-one. The Pythagorean School in ancient Greece had a saying, 'all is number'. Held reveals the hidden numerical order of our world and our remarkable harmonic relationship with our surroundings.