Relief, intaglio, and planographic (lithography and screenprinting) are the main printmaking techniques. Relief involves cutting away areas to leave a design standing in relief, like woodcut. Intaglio techniques such as engraving and etching cut lines below the surface to hold ink. Planographic techniques do not involve a raised or incised surface, instead using the absorption of ink on a flat surface like stone or screen. Within these categories, different materials and tools produce varied aesthetic effects that have been used by artists over centuries to create unique and widely disseminated works.