4. Synesthesia
Synesthetes experience one sense through another—for example, tasting words or seeing colors when hearing music. Grapheme-color synesthesia, where letters and numbers have specific colors, is one of the most common forms. It’s not a disorder but a fascinating blending of the senses, often enhancing creativity. Many famous artists and musicians, like Pharrell Williams and Vincent van Gogh, reportedly had synesthesia.