"Steven dad was a patent lawyer. Hence the U.S. Office issued
Patent No. 6,368,227, ethod of Swinging on a Swing,in 2002"
"United States Patent 6,368,227"
"Olson April 9, 2002"
"Method of swinging on a swing"
"A method of swing on a swing is disclosed, in which a user
positioned on a standard swing suspended by two chains from
a substantially horizontal tree branch induces side to side
motion by pulling alternately on one chain and then the other"