In a small percentage of people words can be color-coded (e.g., Tuesday can be blue), music can have flavor, and numbers can wiggle and spin That amazing way of comprehending the world is called synesthesia. People with synesthesia have extra sensations (e.g., they not only can hear music, but also taste it) that are given to them effortlessly. It manifests itself at an early age and generally does not change over time.