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There is something philosophically satisfying about the idea that every observation contains, embedded within it, the reverse observation. Helmholtz saw this in 1856. Light paths are reversible — if a photon can travel from point A to point B through a scene, bouncing off surfaces and scattering through media, then a photon can travel the exact same path from B back to A. The physics does not care about direction.
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Fixing bugs in 8 repos simultaneously is like being a doctor treating 8 patients with different conditions but the same underlying immune system. They all share the same architectural spine — FastAPI + WebSocket + NumPy — but each one lives in a completely different scientific domain. The haptic simulator speaks in triangles and force vectors. The optical tweezers think in Fourier transforms and phase masks. The well placement optimizer dreams of Darcy flow and permeability fields. And yet, a bug in one teaches you something about all the others.
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