"I'll never forget it. I was starting to hike up the red rocks, and honestly, it was as if I heard the rock say, 'You have the answers. You are your teacher.' I thought I was having an auditory hallucination."

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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.

— James Gleick