A mask is an object normally worn on the face, typically for protection, disguise, performance, or entertainment. Masks have been used since antiquity for both ceremonial practical purposes. They are usually worn on the face, although they may also be positioned for effect elsewhere on the wearer's body.Throughout the world, masks are used for their expressive power as a feature of masked performance - both ritually and in various theatre traditions. The ritual and theatrical definitions of mask usage frequently overlap and merge but still provide a useful basis for categorization. The image of juxtaposed Comedy and Tragedy masks are widely used to represent the Performing Arts, and specifically drama.