During the 1950s, some artists turned to the "truth-to-materials" doctrine. This movement entailed an emphasis on the collective production of crafts work. Craftsmen sometimes worked together during this period to develop more ambitious projects. Throughout the 1950s and afterwards, potter Peter Voulkos developed increasingly largescale and nontraditional ceramic works, influenced by Abstract Expressionism, which transformed traditional understandings of the craft media. Like the Abstract Expressionists, Voulkos emphasized performance, process and primal expression in his ceramic forms. In some cases, Voulkos deconstructed and reconstructed traditional ceramic vessel forms such as plates, ice buckets, and tea bowls. In other works, Voulkos created new nonutilitarian forms, such as his purely sculptural, large-scale cylindrical "stacks."