This Angus McKie flying saucer is one of my favorite retro sci-fi works. Take a second and drink in those 70s colors, the crisp detail, the church steeple reflecting the pink hues of the UFO above.

The art began its life as a cover to Young Person's Guide to UFOs, a nonfiction book that was printed once in 1979 and then never again. It was repurposed fo…