My Dad worked in the research labs at Eastman Kodak, where he eventually devised the "Bayer filter" used in digital cameras.

Around 1962, there was an open house evening, the first time I set eyes on a computer. I briefly got to play this exact game.

Later that year, I busted up a bunch of spring clothespins, to use as toggles to work out binary arithmetic from a book our grandfather had given us. The look on my Dad's face was priceless.