It's hard to pinpoint when synesthesia, the rare neurological condition where a stimulus that affects one sense prompts a response in a different sense, was first documented. Scientific literature ...

A person hears a piece of music and, at the same time, sees a deep blue colour. Another reads a word and senses a light taste, as if flavour ...

Why is white noise white? What would orange or purple noise sound like? According to novelist Janet Fitch, “You can’t describe a color without synesthesia” (Fitch). To a large degree, the same holds ...