These two categories are planographic, also known as lithography, and stencil methods. There are two categories of methods within the surface processes. These three techniques are known to be surface, relief, and intaglio. There are three major techniques that are typically used in printmaking. The reason why each multiple art print is considered an original is because the print is an original to begin with the imagery that is presented in is typically a unique image that is designed by the artist. What is special about printmaking is that it allows an artist to create multiples of his or her art prints however, despite the creation and existence of such multiples, each art print is considered to be an original art piece respectively. Artists use a range of techniques for printmaking. Printmaking is the art form that has to do with the production of images on various types of materials, including paper, parchment, plexiglass, plastic, or any other form of material that the artist chooses to create his or her art prints on.