Whitney was striving to invent a "synthesizer for the future". Developed with Dr Jack Citron, the Whitney-Reed RDTD (Radius-Differential Theta Differential) was the tool with which John Whitney was able to able to redefine audio-visual composition. For Whitney it was the beginning of the future of his vision of digital harmony, one which he left for future artists to continue. "I've struggled to define my vision. The union of color and tone is a very special gift of computer technologies."