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Birch and Rabinowitz (1951) adapted the two-cord problem from experiments by Norman Maier (1930, 1931), where a participant would be shown two cords hanging from the ceiling and instructed to connect them, but the cords are far enough apart so that the participant cannot reach one while holding the other. The only solution was to tie a heavy object to one cord as a weight, making it possible to swing the cord as a pendulum, then catch the swinging cord while holding the stationary cord, and tie them together.

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