Farther along on the Rue des Lions-Saint-Paul, I noticed a couple of things that reminded me I really was in the middle of a big city. Here's the first one. It has to do with parked cars — and local residents' complaints about where people park them.
It says, basically: "To whom it may concern, May we point out that stopping and parking [in front of this doorway, I assume] are not allowed. In the case of unwelcome stopping, we will call to request that your vehicle be towed and impounded. Cordially..."
And then I saw this example of what I assume is street art. It's posted on a wall that seems to have had graffiti painted on it, which has been painted over.
I'm not sure exactly what this colorful message is supposed to mean. It says something like: "Silence wears us down" or "...eats away at us." The verb miner is related to our verb "to undermine". On Facebook or other blogs, I've found photos of several other signs like this one the people have seen in different parts of Paris, but nobody says who put them up or what political goal or social cause is behind them.