Clarence R. Thorn, a freelance specialist from Washington, DC, created this month's cover design to symbolize the history and progression of the Parachute Club of America and its successor, today's USPA.  His design first appeared on the 25th anniversary edition of PARACHUTIST in August, 1982.  PCA's original symbol, the triangle was based on a sketch by Leonardo da Vinci (1452-1519), who envisioned a way for man to descend from the sky even before the concept of air travel.