Picasso is also credited with inventing constructed sculpture and co-inventing the collage art style. He is also regarded as one of three artists in the twentieth century credited with defining the elements of plastic arts. This revolutionary art form led society toward societal advances in painting, sculpture, printmaking and ceramics by physically manipulating materials that had not previously been carved or shaped. These materials were not just plastic, they were things that could be moulded in some way, usually into three dimensions. Artists used clay, plaster, precious metals, and wood to create revolutionary sculptural art work the world had never seen before.