A visual equivalent of tangibility, or the opposite – a phantom, spectrum? On the one hand a shadow shows three-dimensionality of things, but on the other it often remains a plane, an abstract sign. Focusing on it we move from reality to observation of pure qualities and their relations: subtlety of light and shadow grades, the course of line of a border between shadow and light, as well as deformation on the surface covered by shadow. The shadow appeals to us just with this contradiction of chiaroscuro spaciousness, and immateriality of a projected shadow – a purely visible shape, loosely attached to its owner (what casts this shadow). A shadow outline is a founding myth of painting.