Reminds me of a family story about my aunt recounting a Feynman lecture to her kids. She was drawing some diagrams he'd used and they said, "Wait a minute, how

Reminds me of a family story about my aunt recounting a Feynman lecture to her kids. She was drawing some diagrams he'd used and they said, "Wait a minute, how do you know what these looked like? Weren't you just listening to the audio?" She realized that Feynman's verbal explanations were so clear that she had not had any trouble visualizing the diagrams as he drew and discussed them.