Berlin Buddha made of Incense Ash

The Berlin Buddha is an ash sculpture of a Buddha by Zhang Huan, which has been made by casting the ash of burnt incense to the interior of an aluminium sculpture. The aluminium sculpture was then installed to face the ash version. As time went by, the environment affected the work, as the floor trembled with movement, the ash Buddha gradually disintegrated into a mound of particles. 

You can read more on his website here