Intuition was not just visual but also auditory and kinesthetic. Those who watched Feynman in moments of intense concentration came away with a strong, even disturbing sense of the physicality of the process, as though his brain did not stop with the grey matter but extended through every muscle in his body.

Genius: The Life and Science of Richard Feynman (ed. Open Road Media, 2011) - ISBN: 9781453210437