Text - based online training content can benefit from images, videos, and
other multimedia components, especially when they provide visual representations that improve understanding and knowledge retention.
The most significant of the often loosely defined movements of early contemporary art included pop art, characterized by commonplace imagery placed in new aesthetic contexts, as in the work of such figures as Andy Warhol and Roy Lichtenstein; the optical shimmerings of the international op art movement in the paintings of Bridget Riley, Richard Anusziewicz, and
others; the cool abstract images of color - field painting in the work of artists such as Ellsworth Kelly and Frank Stella (with his shaped - canvas innovations); the lofty intellectual intentions and stark abstraction of conceptual art by Sol LeWitt and
others; the hard - edged hyperreality of photorealism in works by Richard Estes and
others; the spontaneity and
multimedia components of happenings; and the monumentality and environmental consciousness of land art by artists such as Robert Smithson.