I have called this principle, by which each slight variation, if useful, is preserved, by the term of Natural Selection.
-- Charles Darwin
Beagle is a tool for exploring different combinations of variables with decreasing generational variance once a pick has been made. In other words, it will let you make combinations at random of several variables, pick one, then make more variations that will be more similar to the last choice each time.
This was inspired by Wii and Xbox avatar creators, in which you can fully customize your avatar, but the starting point will be a small range of possibilities, then the choices will be refined until you feel comfortable fine-grain fixing the details.
Made as a part of a Breezi experiment
For a quick demonstration, simply run the command
rake sample_run