Synesthetic Gesture

Just came across this over on Boing Boing, a post about a book on synesthesia has this quote form the author:

For example, sight, sound, and movement normally map to one another so closely that even bad ventriloquists convince us that whatever moves is doing the talking. Likewise, cinema convinces us that dialogue comes from the actors' mouths rather than the surrounding speakers. Dance is another example of cross-sensory mapping in which body rhythms imitate sound rhythms kinetically and visually. We so take these similarities for granted that we never question them the way we might doubt colored hearing.