NPR News

The word "uneven" gets tossed around in critical parlance to signify artists whose fingers stray from the quality-control button — to suggest that they don't know their own genius when they hear it.

Cities and cars share a conflicted relationship these days. Environmental concerns, growing traffic congestion and an urban design philosophy that favors foot traffic are driving many cities to try to reduce the number of cars on the road. In cities such as Seattle, Chicago, Toronto and Boston, some people go so far as to claim there is a "war on cars."

Those eyes grab you first. Only after a couple of beats do you realize you're looking at the painted bottom of a flattened metal can left on the street, and not some mysterious fairy.

These can art people come from the imagination of a British artist known as My Dog Sighs, who has left a piece of art on the street for someone to find every Friday for the last 10 years.