Every week I'll throw out one thing I love. You are free to discuss it. This week, I love the fact that prime numbers are not rectangular. (Composite numbers can be represented as rectangles where one of the dimensions is greater than 1. Prime numbers can't, because the height or the width would be a factor other than 1 and the number itself.) I'm thinking about how to build a prime number generator out of things like magnetic balls. Throw some balls in and see if they can form a rectangle. If they can't, that's a prime number. If they can, throw in another ball and repeat.