A circus is a traveling company of performers including acrobats, clowns, trained animals, hula hoopers… Common acts include a variety of acrobatics and gymnastics including tightrope walking, trapeze and floor routines, the combination of juggling and gymnastics is called equilibristics and include acts like plate spinning.Clowns are common to most circuses.Daredevil stunt acts and sideshow acts are parts of circus acts, including human cannonball, chapeaugraphy, fire eating, breathing and dancing, knife throwing, magic shows, sword swallowing or strongman. Juggling is a form of object manipulation. The most recognizable form of juggling is toss juggling, where the juggler throws objects through the air. Jugglers often refer to the objects they juggle as props, the most popular being balls, beanbags, rings, clubs, or bouncing balls. Some performers use dangerous objects such as chainsaws, knives and fire torches, although when done by a trained performer using the proper equipment are far less dangerous than they appear. Juggling also includes most prop-based circus skills such as diabolo, devil sticks, poi, cigar box manipulation, fire-dancing, contact juggling, and hat manipulation.