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A steel shaft is meant to do one thing: rotate. When power is cut, it should rest — straight, silent, inert. But in 1889, night watchmen inside a vast machine hall noticed something deeply wrong. Chalk alignment marks drawn along a thirty-meter drive shaft no longer lined up by morning. The shaft had not turned. It had twisted. Bearings groaned softly in the dark. A low metallic hum filled the air, as if tension were building inside the steel itself. Night after night, the same pattern repeated. By dawn, the shaft returned to its original position, leaving no permanent damage — only evidence of motion without rotation. Decades later, engineers revealed the truth: residual torsional stress, thermal gradients along the shaft, and reflected torsional waves had combined to store and release elastic energy. The steel was not moving through space. It was moving through strain.