A torque-feedback mechanism must measure force, pressure, and displacement. The hybrid system or multi-part assembly requires haptic, visual, sound, temperature, or vibration feedback instruments. The technology may take the form of either a standalone sensor cube that flashes according to pressure, or a material that changes behavior, color, or texture. The technology must also be recyclable and sustainable for the environment. No battery is needed; energy harvesting should be possible from vibration, force, and solar power.
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