An hybrid tree, made from an oak (drus) and a basilic (basilikos), built in computer graphics, follows a four-step cycle. Four panels on the wall describe the creation process. Through a cube, the public is led to interact with the tree : the image blurs and the tree whitens, until it is completely white. However, there is a random degradation, thus before disappearing the tree dons a thousand colors. When the interaction stopped, the tree comes back slowly to its initial state.