If you see a rock moving over parabolic trajectory in free fall, do you really think that ACTUALLY rock does NOT move over parabolic trajectory?

Or if a photon is registered by photomultiplier giving pulse of voltage on oscilloscope screen, we should NOT believe our eyes? Or ears when we hear beats between untuned C note and tuning fork and adjust tension of piano string to tune it?

Will a rock move over different trajectory x(t) if seen by alien? Or by some device (say, a camcoder)?

If you answered "yeah, why not?" on the above questions, then you acknowledge that LAWS of physics (say, inverse square, or energy conservation, etc), are actually NOT inverse square or conservation laws but just SEEN by us as such. But then why they neatly predict accurate behavior of things? Anwhy energy of, say, blue photon is ALWAYS equal to 2 eV regardless WHO and HOW measures it?

Planets out there move over certain predictable trajectories (say, circles with the period abot 1 year) REGARDLESS who and how measures those trajectories and regardless what counting or reference or unit system he/she/it uses.