anisotroperstoff aufsatzsammlung brightnessperception chemistry colorperception colorvision composésorganiques contrastsensitivity contrastsensitivity(vision) fotochemie fotoquímicaorgânica helderheidswaarneming helligkeit isotropessystem light lightanddarkness lighthouses luminosité lumière organic organicchemicals organiccompounds organicphotochemistry organischeverbindungen perceptiondelaluminosité perceptionvisuelle phares photochemistry photochimie photochimieorganique physiologicalpsychology pictorial psychology químicaorgânica science sensibilitéaucontraste(vision) shipbuilding ships technologicalinnovations transportation visiondescouleurs visualperception wahrnehmung