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This lack of internal body images became clear one day when she said, “Martha, what is jumping? I don’t understand.” Graham responded at once by calling one of her dancers, Merce Cunningham, to the barre and placing Keller’s hands on his waist. As Graham tells the story, “Merce jumped in the air in first position while Helen’s hands stayed on his body. Everyone in the studio was focused on this event, this movement. Her hands rose and fell as Merce did. Her expression changed from curiosity to one of joy. You could see the enthusiasm rise in her face as she threw her arms up in the air and exclaimed, ‘How like thought. How like the mind it is.
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Robert Root-Bernstein (Sparks of Genius: The 13 Thinking Tools of the World's Most Creative People)