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 publication documents Kaprow s posters a lesserknown side of his work produced between 1953 fand 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 handlettered text and drawings and the later one