What is synesthesia?
Synesthesia:
Synesthesia(also spelled synaesthesia or synestesia; from the ancient Greek syn, "together", and aisthésis "sensation") is a neurogical phenomenon in which stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences
in a second sensory or cognitive pathway. People who report such
experiences are known as synesthetes. It is known as cross over senses