Miniature art or model art is a genre that focuses on art (especially painting, engraving and sculpture) in much-smaller-than-usual sizes. Miniature art societies, such as the World Federation of Miniaturists (WFM), provide applicable definitions of the term. An often-used definition is that a piece of miniature art can be held in the palm of the hand, or that it covers less than 100 cm². Portraits should not exceed 1 3/8inches or 3.5cms from chin to top of head, and in all paintings the spirit of miniaturisation should be maintained.