Synesthesia is a rare sensory phenomenon and neurological disorder in which the stimulation of one sense triggers an automatic, involuntary experience in another sense. People suffering from synesthesia may see sounds, taste words or feel a sensation on their skin when they smell certain scents. They may see a taste or taste a color. Tuesday may look like the color green to them. It’s quite amazing and interesting. Linked below is an awesome ted talk that explains it well.