This new survey covers the rich and varied history of participatory art, from early happenings and performances to current practices that demand audience interaction. As the internet mindset - browsing, sharing, collecting, producing - increasingly permeates every aspect of society, this timely project reveals the ways in which artists and viewers have approached the creation of open works of art. Original essays identify seminal moments in participatory practice from the 1950s to the present day, while a rich array of plates reproduces the work of the movement's major figures in vivid detail.