Jiro Takamatsu (1936-1998) was about a seminal as seminal gets in postwar Japanese art. He was one-third of the Tokyo-based Happenings group Hi Red Center, a progenitor of Japanese conceptual art, and a significant influence on Mono-ha artists. As a maker of paintings, sculptures, experimental writing and xerographic pieces, and conceptual photographs, Takamatsu embodied the catholic cross-mediality of the 1960s and ’70s like few others. And as his mini-retrospective at Fergus McCaffrey suggested, he was also something of a prop and set designer for intellectualised play and theatricality in the white cube…