Did you know that the Wright brothers invented their flying machines in the back of their Dayton, Ohio bicycle shop? Observations recorded from watching bird flight and the action of balancing and turning a bicycle lead them to believe that a flying machine needed not two, but three axes of control (pitch, yaw and roll) in the fluid of air. Pitch and yaw were easily controlled by horizontal and vertical rudders. Roll control was the problem. The answer came to Wilbur one summer night as he twisted an empty inner tube box while talking to a customer in the bike shop. Wing warping. One of the great AH-HA! moments in aviation history.