Sonochromatism or sonochromatopsia (Latin: sono-, (sound) + Greek: chromat- (colour) + Greek: -opsia (seeing)) is a neurological phenomenon in which colours are perceived as sounds.[1] The phenomenon is created by the union between a brain and a colour-to-sound software or chip. People who report such experiences are known as sonochromats.[2] The term was coined by Neil Harbisson to differentiate his experience of colour from people with chromesthesia or colour-to-sound synesthesia.[3]