synesthesia is more common in artists who excel at making metaphors

Not surprisingly, synesthesia is more common in artists who excel at making metaphors,like novelist Vladimir Nabokov,painter David Hockney,and composers Billy Joel and Lady Gaga.But why do the rest of us non-synesthetes understand metaphors like sharp cheese or sweet person It so happens that sight,sound,and movement already map to one another so closely,that even bad ventriloquists convince us that the dummy is talking.Movies, likewise, can convince us that the sound is coming from the actors' mouths rather than surrounding speakers.So, inwardly, we're all synesthetes,outwardly unaware of the perceptual couplings
happening all the time.Cross-talk in the brain is the rule,
not the exception.And that sounds like a sweet deal to me!