Juggling is a physical human skill involving the movement of objects, usually through the air, for entertainment (see 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 common props are balls, beanbags, rings, clubs, an bouncing balls. Some performers use dramatic objects such as chainsaws, knives and fire torches. The term juggling can also refer to other prop-based circus skills such as diabolo, devil sticks, poi, cigar box manipulation, fire-dancing, contact juggling, hooping and hat manipulation.