Carl Andre is the overall-clad sculptor whom many historians consider a defining figure in the development of Conceptual and Minimalist art. Legend claims that Andre began his current practice after his close friend Frank Stella called the wooden castoffs of a project sculptural objects as well; Andre has also said that Constantin Brancusi was an instrumental influence. He first won public attention in the 1960s for his groundbreaking multi-part sculptures whose pieces were not fixed but lain directly onto the ground. In fact, Andre considers himself one of the first “post-studio” artists because he uses manufactured industrial materials that he does not alter, but rather arranges on-site; common materials include square plates or blocks made of aluminum, nickel, zinc, copper, steel, lead, limestone, and wood. Many of his arrangements are also based on arithmetic and geometry.