This sound-seeing was something he had always kept to himself.
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Do you have grapheme-color synesthesia? - the Southerner Online
Seeing letters and numbers in color is a form of synesthesia called grapheme-color synesthesia. In this condition, individuals experience colors associated with letters, numbers, and other symbols, according to the Cleveland Clinic. These color associations are consistent and involuntary, meaning they are not something the person consciously chooses or can control.
Individual variations:
While some color-letter pairings are common across synesthetes, each individual's palette of color associations is unique.
How it works:
While the exact mechanisms are not fully understood, synesthesia is believed to be related to the way the brain processes sensory information. In the case of grapheme-color synesthesia, it's thought that the brain's pathways for vision and color perception are somehow linked to the pathways for language and number recognition.