As I've already mentioned, JR is amazing with his simple vision of just using people's faces to spread autonomy and owernship.

In this context, I'm looking at the work he has done in India.
Using glue to draw an image - the environment providing the pigment.

Again, this simple and discreet way of creating an image on a surface is really effective.

It reminds me of my idea to power wash dirty buildings with stencils to create images - minimal influence on a surface, yet an image is visible.

http://www.onesmallseed.net/profiles/blogs/french-street-artist-jr