Line 3: contaminated

I can't help noticing that the street art is growing. I think the RATP - which apparently already took some mesures to erase these works - will end up reacting very badly.
I can also notice I'm not alone to take pictures...
Some of these pieces are interesting, colorful and inventive. Sometimes, like here, the sign is preceded by the inscription "Line 3 Lover" (in English)...
Pictures taken between December 2007 & January 2008.
The writings can be huge....