A related article with some more complicated circuits http://www.damninteresting.com/on-the-origin-of-circuits/ http://www.damninteresting.com/on-the-origin-of-

A related article with some more complicated circuits http://www.damninteresting.com/on-the-origin-of-circuits/ http://www.damninteresting.com/on-the-origin-of-circuits/ This was evolving an FPGA to do things like detect tones or voice commands. Weirdly reminiscent of DNA, logic cells which were apparently useless would cause the circuit to break when they were removed. Neither did the layout work when transferred to an identical FPGA.