A giant canvas of 12.6 meters long by 7 meters wide on the ground, covering the pedestrian crossing with a large leafless tree.  As pedestrians walked towards the crossing, they would step onto the green sponge and as they walked, the soles of their feet would make foot imprints onto the tree on the ground. Each green footprint added to the canvas like leaves growing on a bare tree, which made people feel that by walking they could create a greener environment. The project was done in 15 different cities in China.

Created by Jody Xiong