the ball itself http://www.ideafinder.com/history/inventions/wheel.htm «Uruk: The Invention of The Wheel» History of Wheels The Wheel Was Invented In Ancient Mesopotamia http://www.ideafinder.com/history/inventions/wheel.htm History of Wheels History of Wheels History of Wheels wheel (invented circa 3500BC Wheel History - Invention of.. wheel (invented circa 3500BC History of Wheels wheel (invented circa 3500BC wheel (invented circa 3500BC round objects the ball itself http://www.ideafinder.com/history/inventions/wheel.htm History of Wheels http://www.ideafinder.com/history/inventions/wheel.htm