We walk by graffiti every day. At the City of Vancouver, however, it's the staff's job to record instances of what may be described as street art or vandalism, depending on your point of view and the intent of the creator.
Thanks to this map by Tom Nightingale, we can visualize just how widespread graffiti is in the city. It's based on data from the city's open data catalogue, which is now over two years old. The darker, redder hexagons indicate clusters of graffiti.