I'm coming late to the party, but various notation systems for dance have been in regular use since the 18th century. Many 19th century choreographies have been preserved that way, especially from the Russian Imperial Ballet (now Kirov/Mariinski).
Today (actually since the early 20th century), apart from video documantation, major ballet companies regularly employ "choreologists", whose task is it to take down the choreography for further generations.
It is, of course, quite possible that nobody bothered to notate the "Sacre" choreography, as it obviously didn't work with the music.
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Grammar:
The difference between knowing your sh**
and knowing you're sh**.
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