Graffiti is art that is written, painted or drawn on a wall or other surface, usually without permission and within public view. Graffiti ranges from simple written words to elaborate wall paintings, and has existed since ancient times, with examples dating back to ancient Egypt, ancient Greece, and the Roman Empire.
An abandoned roof felt factory with graffiti in Santalahti, Tampere, Finland
Ancient graffito in the Kom Ombo Temple, Egypt
Ancient Pompeii graffito caricature of a politician. Villa of the Mysteries.
Figure graffito, similar to a relief, at the Castellania, in Valletta
A mural is any piece of graphic artwork that is painted or applied directly to a wall, ceiling or other permanent substrate. Mural techniques include fresco, mosaic, graffiti and marouflage.
Ceiling painting, by Jean-André Rixens. Salle des Illustres, Le Capitole, Toulouse, France
Prehistoric Egyptian mural painted on a Nekhen tomb wall c. 3,500 B.C. with aspects in the Gerzeh culture style
Jataka tales from the Ajanta Caves, present-day Maharashtra, India, 7th century CE.
Murals from the 16th century at the St. Lawrence Church of Lohja