Traditionally, breakers dance within a "cypher" or an "Apache Line". A cypher is a circular shaped dance space formed by spectators that breakers use to perform or battle in. Cyphers work well for one-on-one b-boy or b-girl (break-boy/break-girl) battles; however, Apache Lines are more appropriate when the battle is between two crews—teams of street dancers. In contrast to the circular shape of a cypher, competing crews face each other in an Apache Line, challenge each other, and execute their "burns" (a move intended to humiliate the opponent, i.e. crotch grabbing).