Allan Kaprow is considered to be the founding father of the Happening, of Environments and Activities: terms that he continued to redefine throughout his career.

With a wide selection of images, this unique large-format publication documents Kaprow’s posters, a lesser-known side of his work, produced between 1953 and 1996.

Most of these posters were designed by Allan Kaprow and are characterized by their aesthetic quality, the earliest ones in particular a combination of hand-lettered text and drawings and the later ones of photographs and typographic text in a minimalist style.

More than merely advertising Happenings or Activities, these posters act as scores/tools for the participants to the Happenings and as everyday objects that blur the boundaries between art and life.

In 1962, Allan Kaprow (1927–2006) took the decisive step from assemblage to happenings with his "Stockroom" environment, devised for the Moderna Museet Stockholm’s famous exhibition Art in Motion. This book is the first to document all nine reprisals of the "Stockroom," five of which were done posthumously.