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.
Medieval dance
History of European medieval dance is fragmented and limited, but is believed that simple folk dances were widespread among common and wealthy classes.
Wide Eyes
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.