In 1988, Michael Jackson had his fans in awe when he released his music video “Smooth Criminal”, but it was not the 1930′s night club plot that had jaws dropping, it was his latest dance move- the anti-gravity lean. Standing up straight, the dancers were able to defy gravity, leaning over at a forty-five degree angle to the floor. In the music video they used strings, but when Michael wanted to take this move on the road they had to get more creative. With the help of two co-inventors, MJ created the Anti-Gravity Shoe. Now with a few hidden bolts on the floor, audiences could enjoy this magical dance move on stage.
The abstract reads:
A system for allowing a shoe wearer to lean forwardly beyond his center of gravity by virtue of wearing a specially designed pair of shoes which will engage with a hitch member movably projectable through a stage surface. The shoes have a specially designed heel slot which can be detachably engaged with the hitch member by simply sliding the shoe wearer’s foot forward, thereby engaging with the hitch member.
See the full patent text here.