This outdoor project is created by The China Environmental Protection Foundation. Sponge cushions soaked in green paint were placed on both side of the road, just beneath the traffic lights. So everytime a padestrian walked towards the crossing, they stepped on the green sponge cushions and while walking further they were leaving green foot imprints on the canvas and created leaves. They made leaves grow on a bare tree, which made them feel that by walking they could create a greener enviroment. How amazing is that?!