Panos 2013 Fake Street Signs is a collaborative project that takes the work of artists from around the world, in the form of fake road signs, and turns the streets of Lyon, France into an enormous gallery without walls. 

The round red and white signs look enough like real European traffic signs that you might take them for granted, but weird enough if you notice them to make you stop and think.

This project has a delightful sense of humor, lots playful absurdity and a wonderful scale.