Naturalism in art refers to the depiction of realistic objects in a natural setting. Some theorists restrict the terms "Naturalism" and "Realism" for use as labels for period styles of the middle and late nineteenth century in Europe and America; the terms "naturalism" and "realism" (all lowercase) however may refer to the tendencies of art of any period so long as the works strive for an accurate representation of the visible world. In the context of filmmaking, naturalism is spoken of in relation to a set of aesthetic principles, as well as a certain kind of scenic expression. Naturalism in film is implemented through a film’s application of light, its costume and art design, as well as its actors’ performance, whereby in each case the focus on authenticity and proximity to reality is key. A naturalist approach to filmmaking thus demands a representation of life in the most “natural” way possible.