Each tile of the mosaic can be activated by a linear motor extracting them 10 cm. The individual control of the tiles’ motion allows the creation of three-dimensional reliefs based on simple geometric patterns. These patterns appear at irregular moments and decompose following random logic. The programming of the motion follows compositional principles balancing between ordered and random configurations. Whereas the formation of patterns underlines the geometric design, the random arrangements underlines the play of light.

The tiles are retro-illuminated projecting white light on the black back-plane. When the tiles move, grey gradients of different intensity appears up to the point that they appear entirely white. The luminous white surfaces on the black background gives the illusion of shadow - but bright shadows. This inversion between light and shadow leads to an optical effect: a tile extracting produces an invert movement.

This installation has been conceived as a complementary to the rgb, white version. The program controlling the motion of the tiles is exactly the same in both versions. But where in one version the balance between colours and geometry is achieved through the ordered and disordered arrangements of the tiles, in this black version the optical effects establish the dialogue.