This editorial and photos was taken by Dylan Reid from the Spacing Toronto Blog. It's amazing how many abandoned high-rises Detroit has. In the first picture below you can see trees growing on the roof tops.
"Detroit must be some kind of graffiti artist heaven — there are almost endless amounts of deserted, empty walls across the city in neglected streets and abandoned factories and buildings, and a City government that must have much bigger priorities for its limited resources.
...Detroit has one thing other cities don’t have — entire high-rise buildings that are deserted — and it has developed to a high art a form of graffiti that uses the windows of buildings."