Alongside an American painter sat Dutch Corry Riet, who was paralyzed by polio at the age of five. She learned to hold a brush with her teeth and makes a living from her paintings.

Charles Pasche was born with no right arm and only a useless stump where his left arm should have been. Like many such “congenital amputees” (cause unknown), he learned to do an amazing variety of everyday tasks with his toes. It seemed impossible that he could ever become expert at…