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MIT engineers have created a soft, stretchable sheet that reconstructs its three-dimensional shape as it bends and twists. Unlike motion-capture clothing fitted with rigid sensors, the material contains flexible optical fibers arranged in zig-zag patterns inside silicone. One side of each rubber fiber is deliberately roughened, so bending it in different directions changes how much light reaches the other end. An algorithm combines these light measurements to generate a moving digital twin of the entire surface almost in real time. Tests against precisely shaped molds found an error below 0.4 centimetres, compared with roughly 1 to 2 centimetres for existing rigid-sensor designs. The sheet also remained accurate when several fibers were cut or disconnected because the surviving network still carried enough information. Thinner and more numerous fibers could eventually turn the system into comfortable garments for tracking rehabilitation, controlling virtual characters or operating robots remotely.