I read about it in the "Supermen" book [1], he dug extensive tunnels. Doing repetitive work makes it probably easier to do daydreaming. That's how he designed h

I read about it in the "Supermen" book [1], he dug extensive tunnels. Doing repetitive work makes it probably easier to do daydreaming. That's how he designed his Cray super computers architectures in his head. [1] http://www.amazon.com/The-Supermen-Seymour-Technical-Supercomputer/dp/0471048852/ http://www.amazon.com/The-Supermen-Seymour-Technical-Superco...