The “dead bird” is a classic lesson. The image refers to the way you hang the arm in front of the face, at eye level or a little lower–with the wrist limp, like a dead bird’s wing. I was listening to Moshe teaching it at Amherst. He says, maybe it’s an intelligent bird’s wing. Not a bird mindlessly using energy or effort to hold the wrist stiff…
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Based on “Seated and twist left” from Amherst: http://feldynotebook.com/Seated+and+twist+left