Dancers have better than average peripheral vision. Head angles are prescribed by the dance, so dancers have to use their eyes themselves if they want to look to the side, without turning their heads.
Bare feet
Dancing in bare feet enables the dancer to connect directly with the floor. Some modern dancers put tape on their toes and the balls of their feet to make it easier to turn and slide.
Structured dance
One of the earliest uses of structured dance was introduced in religious ceremonies that told the stories of ancient myths and gods.
