The document defines medium as the material used to create a work of art, such as clay, paint, or sound. It distinguishes techniques as the methods used to manipulate the medium, such as carving or playing an instrument. Various art forms are classified based on their medium, including musical, practical, environmental, pictorial, dramatic, and narrative arts. Sculpture, architecture, painting, printmaking, music, dance, theater, photography, film, and writing are discussed in terms of their characteristic mediums and techniques.