Lithos is Greek for "stone", and a stone surface has traditionally been involved in lithography, though a metal plate may take its place today. The lithographic process was invented around 1796 and soon became the main method of printing books and newspapers. Artists use lithography to produce prints (works intended to be sold in many copies), and art lithographs sometimes resemble older types of prints, including etchings, engravings, and woodcuts. Pablo Picasso, Marc Chagall, Joan Miró, and M. C. Escher are among the many artists who have used lithography to produce important original works. Today lithographic printing accounts for over 40% of all printing, packaging, and publishing.