Every twentieth German perceives numbers, letters, sounds, people, or pain in different colors because their brain associates what is seen, heard, or felt with specific colors. Their brains are more interconnected, allowing these individuals to have multiple perceptions in response to a single sensory stimulus. Synesthetes often have excellent memories and are frequently engaged in creative professions. Famous examples include the poet Johann Wolfgang von Goethe and the painter Wassily Kandinsky. This book provides an overview of synesthesia and sensory perceptions.