In the early 17th century realistic still life became an independent genre in art, but it was considered less important than historical and allegorical representations of the period. Appearing as an independent genre around Europe in the same years, it is impossible to discern who first developed and practiced still life art in painting. In the 20th century still life was considered a theme in art abreast with others. The development of still life art closely followed the stylistic changes of the period, from Fauvism, Expressionism, Cubism, to Pop Art and Photorealism. Still life objects even transgressed the frame of the traditional medium of painting and entered the art scene as art objects through ready-mades and installations where instead of being represented, they became artworks themselves, as in Arman’s and Judy Chicago’s works.