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As for the other, it is called, "Chroma Key" for the ladies and monofilament strand for the "bells"...




Mac, my amico, did you miss the scene where they passed the silk sheet between the upper beam and the tops of the bells? But holster yer shootin' arns, Yosemite Sam! Your theory is reinforced later when a bell, recently struck, starts a pendulum motion which indicates that it is, indeed, suspended from above.