A fundamental requirement of all classical ballet, which involves rotating the legs and feet outwards from the hips so that the feet point sideways while the hips remain facing forward. Turnout was declared an essential element for dance by Blasis in 1820, although it had been around for more than 200 years before his pronouncement. The use of turnout was documented in Feuillet's Chorégraphie (1700), which codified the five positions of the feet. The idea of turnout is to give the lower body greater freedom of movement in every direction. Turnout depends on flexibility in the hip socket, which is developed over many years of careful ballet training.