 Inspired by Newton’s theory of music-color correspondences, the French Jesuit Louis-Bertrand Castel designed a color harpsichord (clavecin oculaire) with colored strips of paper which rose above the cover of the harpsichord whenever a particular key was hit (Campen 2007, Franssen 1991).Renowned masters like Telemann and Rameau were actively engaged in the development of a clavecins oculaire.The invention of the gas light in the nineteenth century created new technical possibilities for the color organ.