Imagine for a moment that you and a group of strangers are asked to design a set of rules that will govern the city that you live in. Except there’s a catch: while deciding on these rules you don’t know whether you’ll be rich or poor; young or old; able bodied or disabled; smart or not; black, white, male, female, gay, straight, etc. In other words, you know nothing about what your circumstances will be when you emerge from your deliberations.