Hauser & Wirth opened its first US gallery with a presentation of Allan Kaprow's (1927-2006) seminal Environment Yard: a mountain of black rubber auto tires and tarpaper-wrapped forms through which visitors jumped and crawled, first made by the artist in 1961 and reinterpreted in other locations. This volume documents a reinvention of Yard by William Pope.L at the site of the work's original creation.