Modeling is distinguished from other types of public performance, such as an acting, dancing or mime artistry, although the boundary is not well defined. Appearing in a movie or a play is generally not considered to be modeling, regardless of the nature of the role. However, many models have also described themselves as actors. The models have to express an emotion and feeling in their photographs. Types of models include glamor, fashion, fitness, bikini, fine-art, and body-part models.