Peter Hächler (1922–99) was one of the most formally radical, and most revered, sculptors in contemporary Swiss art. His work was characterized by a geometric rigor leavened by an intuitive playfulness, even as he took to working with industrial materials like concrete, plastic, cast iron, and stainless steel. Many of his sculptures are truly monumental, vast works designed for display in public spaces and serving as art-in-architecture.