MachineMachine /stream

Patent number 5255452, filed in 1992, shows how Michael Jackson and his dancers could lean at 45-degree angles during live performances of the song "Smooth Criminal".

1. A system for engaging shoes with a hitch mans to permit a person standing on a stage surface to lean forwardly beyond his or her center of gravity, comprising: "...at least one shoe having a heel with a first engagement means, said first engagement means comprising a recess formed in a heel of said shoe covered with a heel slot plane located at a bottom region of said heel, said heel slot plate having a slot formed therein with a relatively wide opening at a leading edge of said heel and a narrower terminal end rearward of said leading edge, said recess being larger in size above said terminal end of said slot than is said terminal end of said slot; and a second engagement means, detachably engageable with said first..."