graffiti on a wall is graffiti. graffiti on canvas is post-graffiti. Graffiti is looked down upon in our society, but post graffiti is accepted everywhere. U see post graffiti everywhere now a day like in advertising and media so i say keep on with the graffiti on canvas. It may not be accepted by hard core writters, but who gives a flyin fuck! are u gunna let l the hard core writters in the world tell u where when and how to paint. fuck that, be an individual and think and do for yourself.