self.life = rand()

Randomness
(A Screensaver i happened to come across)

The "Walk of Life" is always uncertain. You may chalk your path, but detours are always a FOL (Fact Of Life). How much ever you might plan to make your life toe a line, it always has a certain degree of uncertanity. And I personally believe this is what makes life exciting. This incident was one "geeky" reminder of that fact.