I am intrigued with the classiification of "Transportation" in your discription of this image, and can only speculate that this is some sort of street side call box for road service [?].
The image of a painted graffiti heart on such a mundane and utilitarian object certainly makes for wonderful abstract art at its best, and finding this in Paris, the "City of Love" should not be a surprise for us all.
Nicely framed, good exposure, and a very interesting image.