: term applied to the arrangement of institutionally illicit marks in which there has been an attempt by an individual or group of individuals (usually not professional artists) to display upon a wall or surface that is usually visually accessible to the public. Even if one has never seen before, a negative image would probably pop into one’s mind after reading this definition. is not only a work of art, it also includes the underground culture that surrounds and reveres that art. has been found in early societies, but is most commonl ....