Dark electronic.

“These men are design engineers at Bell Telephone Laboratories. The research and development part. They are about to engage a new breed of computer called Machine One in a dialogue that will test the ingenuity of both men and machine. It’s a new way of working out abstract problems, which explains why the technique is called ‘computer logic.’ If they do this, what will happen? Will the computer (signal when it’s ready?) If the researchers have done a good job of programming what they want the design to do, there’s no need to memorize complex rules. The computer is quick to point out any breakdown in their logic.”