Back in the Seventies, Marvel Comics grudgingly agreed to return original art to its artists. At least one cartoonist didn't seem to care much, and reportedly used the returned art as cutting boards. Said cartoonist was the enigmatic Steve Ditko, co-creator of Spider-Man and Dr. Strange. His original art is extremely elusive, so if you happen to have a few grand lying around, you may be interested in this eBay auction.