How to detect that the universe got mirrored?
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This might be more fit in physicsSE, but since I don't even know if my premise is physically sound, I'll post it here. One day, something caused the universe to get mirrored, meaning a left-right swap, relative to any arbitrary view point. Let's ignore how this is done, how it's possible to move things over more distance than the observable universe in an instant etc., I only care about before and after. The laws of physics are not affected by this, it's just a change in location and orientation for all particles, energy and so on. Let's say you already suspected that this might happen one day (for whatever reason), so you're regularly doing some kind of test that should change its result after the universe got mirrored. What kind of test could this be? What kind of experiment wo...