Question: The positions of the feet in ballet is a fundamental part of classical ballet technique that defines standard placements of feet on the floor, two additional positions, known as the sixth and seventh positions, were codified in the 1930s by Serge Lifar, who was a French ballet dancer and choreographer of Ukrainian origin, famous as one of the greatest male ballet dancers of which century?
Sentence (from "Positions of the feet in ballet"): The sixth and seventh positions were not Lifar's inventions, but revivals of positions that already existed in the eighteenth century, when there were ten positions of the feet in classical ballet.
Relevant evidence: No