AI Summary

A ball sent across a billiard table travels in a straight line until it strikes a wall, then rebounds at the same angle it arrived. This simple motion obeys a deterministic rule of reflection. Researchers note that, despite its minimalism, such a system can theoretically emulate any computation achievable by a conventional computer. The claim highlights the computational universality of the ball‑and‑wall dynamics, showing that even elementary physical processes can represent complex algorithms.

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