Ah man - this is one of the cooler things i've ever heard of. I first heard of it in PBS doco "Chicago: City of the Century". That documentary - is one of the finest chronicles of modern society i've ever seen. The insights into psychology, civil engineering, and history are second to none. Most profound to me were the "design" of suburbs with the trappings we dont think very much of these days - libraries, pools, shopping centres and so on - were created to push "ideal lives" which were basically the dangled carrots of real estate empires. Brilliant stuff.