Lunar Unicycle. Earth can be seen in the background as explorers work on the surface of the Moon. Artwork from an advertisement for American Bosch Arma Corporation, 1959. Illustrated by Frank Tinsley. "Steps in the race to outer space. This 30-foot high Unicycle is designed for preliminary exploration of the Moon, once a base camp has been established. It's entirely constructed of inflated, rubberized fabric, with the exception of strengthening members, hatches and a few other items. "Electricity for the motors comes from solar batteries mounted in the 'parasol.' The cleated, rotating wheel upon which the Unicycle travels is made of inflated tubes. A spare wheel, carried around the body, acts as a bumper in traversing narrow defiles. Living quarters make up a middle deck. "