body: I recently discovered several videos on YouTube talking about a new form of public art called Reverse Grafitti, the idea being that instead of adding paint to a wall, you form an image by selectively cleaning it. This creates a temporary form that will fade naturally within a short (few months) timeframe.
  
  
  Here is a video demonstrating the idea: <https://www.youtube.com/watch?v=ut96pkYUOiM>
  
  
  Now I know that in most places, grafitti is illegal. However, here are my questions:
  
  
  1. Is "Reverse Grafitti" considered Grafitti? and
  2. Have any similar ideas been brought before a court? What was the result?
  
  
  
title: What is the legality of "reverse grafitti"?