Radical Argentinian artist who demanded the viewer participate in his kinetic art “Art today is nothing but a tremendous bluff,” Julio Le Parc complained in his 1963 manifesto, presenting a series of home truths to the French cultural establishment. “The public is a million miles away from artistic events.” The Argentinian artist, who has died aged 97, had relocated to Paris and was caught up in the social revolts of the decade. His solution was a radical series of works that experimented with l