Specialist books : Hear soup

Scarlet like the sound of trumpets, Blue Monday, sharp notes in
scents—there are few synaesthetes, but their influence on language and on
how we perceive the world is enriching and full of interest to cognitive
neuroscientists. In Synaesthesia (Blackwell, £15.99/$24.95, ISBN 0
631 19764 8), editors Simon Baron-Cohen and John Harrison have collected
classical and contemporary readings to illuminate what is known about this
intriguing condition.