This generously illustrated volume places German sculptor Charlotte Posenenske's groundbreaking works from the 1960s firmly within the history of Minimalist sculpture and Conceptual art. A contemporary of Donald Judd, Posenenske is most known for her body of spare, repetitive forms made from industrial materials, corrugated cardboard, pressboard and sheet metal, which she manipulated and bent for public spaces and performative appearances. In the mid-1960s, after producing several series of Abstract Expressionist and Constructivist paintings, Posenenske began the body of work she is most associated with today: the infinitely positionable and site-specific ventilation shaft-like series "Square Tubes" (1967). She was featured in Documenta 12 in 2007 and her pieces are part of numerous collections, but her work receded from the foreground when she abandoned sculpture in 1968, feeling that art did not have sufficient political impact. Posenenske died in 1985; this monograph secures her legacy.