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The streets of Lyon in France have turned into a gallery without walls with work from artists all over the world. Their work is shown on signs that look like real European traffic signs but with some absurd and comical cartoon pictures, or even some cheerful messages.
In same city you can find a aqua telephone booth. 
Bet the posts above was just one person.
Anyways, those were cute.
The one that looks like a dog with a hat is by the London Police – they’re great artists