This document discusses the neurological phenomenon of synesthesia. Synesthesia occurs when stimulation of one sensory pathway leads to automatic experiences in another sensory pathway. For example, people with grapheme-color synesthesia see letters and numbers as inherently colored. The document outlines several types of synesthesia and proposes that increased cross-talk between brain regions specialized for different functions may explain how it occurs. It suggests this same mechanism may generate creative and intellectual activity as well as dreams. In the end, it expresses appreciation for learning about the complex field of neurobiology.