My notebook drawings and texts investigate Light Dance as a reflexive study of vision, deducing theoretical principles from practice. What we call “light” does not exist in visual experience; the two—light and visual experience—do not exist simultaneously. Rather, in visual experience, “light” is “brightness” that has no spatial or temporal measure of its own, but is so defined only with reference to surrounding visual context. We came to the thesis concept: a principle of equivalence between light and vision.