 Sharing his focus on art and technology are Jack Burnham ("Beyond Modern Sculpture" 1968) and Gene Youngblood ("Expanded Cinema" 1970).They show how art has become, in Popper's terms, virtualized.In his books "Origins and Development of Kinetic Art" and "Art, Action and Participation", Popper showed how Kinetic Art played an important part in pioneering the unambiguous use of optical movement and in fashioning links between science, technology, art and the environment.