This mixing of the senses is called "synesthesia".
Synesthesia is a neurological phenomenon in which stimulation of one sense prompts programmed, automatic encounters of a second one.
Synesthesia is a captivating neurological condition that causes an individual (gladly called a synesthete) to encounter perceptual data through a sense methodology that is unlinked to its source.
Almost every combination of sensory encounters or psychological ideas is conceivable.
Considering music to be hues is one type of synesthesia. Seeing letters as identities is another, or seeing numbers in shading. Notwithstanding hearing hues or contacting smells.