An art movement is a tenency or style in art with a specific common philosophy or goal, followed by a group of artists during a restricted period of time, or, at least, with the heyday of the movement more or less strictly so restricted (usually a few months, years or decades). Art movements were especially important in modern art, where each consecutive movement was considered as a new avant-garde. Movements have almost entirely disappeared in contemporary art, where individualism and diversity prevail.