The Blind Spots are based on scintillating scotoma or visual auras, the sensory phenomena that precedes a change in psychological state. Staring at the black sphere then looking away the visual echo of the circle is transposed onto your field of vision. As large scale 30”x40” Calotypes, the first form of photography, the Blind Spots are developed using the same chemical compound, Silver Iodide, that is used in actual cloud seeding.