If you do go again, download the app FlashInvaders and look for artwork by Invader. He's one of the cities best known street artists and he does tiled mosaics. When you find them, you snap a photo with the app and you get a score. It's lots of fun and he has them ALL over Paris.
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I know EXACTLY who you mean and saw his stuff all over! That's very cool. I will do that.