Ehrenfest sought relentlessly what he called der springende Punkt, the leaping point, the heart of the matter, as for him deriving a result by logical means was never enough: “That is like dancing on one leg,” he would say, “when the essence lies in recognizing connections, meanings and associations in every direction.” For Ehrenfest, true understanding was a full-body experience, something that involved your entire being, not just your mind or reason.
