The author calls attention to a perceptual phenomenon in which certain individuals visualize a color with the hearing of all sounds. There is a striking exactness in which, for example, each vowel sound is accompanied by visualization of the same color in the same individual. An interesting case is presented. The literature is reviewed back to the seventeenth century, and includes Hug-Helmuth's study of the phenomenon in herself. The process, called synesthesia, involves the referral to multiple sense organ systems upon stimulation of a single sense organ. Psychiatric interest stems from the kinship to imagery, dreams, and hallucinations. The speculation is made that children link their auditory memories with other internally felt sensations, such as tongue and larynx movements. The question whether color-hearing normally accompanies language development or represents a variant with possible later psychopathological implications is seen as deserving further study.