Introduction to two decades of artistic ferment in postwar Japan. As that devastated nation confronted the fraught legacy of World War II, a rapid succession of avant-garde groups began experimenting with new media and processes of making art, disrupting conventions to address the changes occurring around them. The works that remain from this era are largely ephemeral - exhibition flyers, programs for performances, musical scores, issues of short-lived journals, documentary photographs, pieces of mail art, and multiples made from the detritus of modern life - but the ideals of engagement and innovation that invigorated this creative surge are not.