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Georgina
Both Relativity and QM attempt to explained what is 'observed' (ie measured), they are just both based on incorrect presumptions as to how physical reality (the very thing they are trying to measure), occurs. In other words, Relativity is no more a theory about observation than QM is. The point about Relativity is the use of references (frames of reference, etc) to ascertain a relative calibration, because there are no absolutes, and (allegedly) matter alters dimension and light curves under certain conditions. It is not, or at least was not meant to be, a theory about the observation of physical reality. QM, because it is dealing with quantum, does not presume from the outset to be able to 'observe', so it pursues measurement (ie observation) in terms of probability, ie all the features in a given circumstance cannot be observed/ measured, because the very act of doing so affects it, etc.
Now, the problem with all this is that what is sensed (observation being just one example) involves the physical receipt of a physical phenomena (it is passive and it is a physical event). And that is not the physical reality. It is the result of a physical interaction with that particular reality and other physical phenomena. That is all it is, physically. The evolution of sensory systems has involved the development of the functional use of it, but that is irrelevant to its physical existence. Or put another way around, no amount of sensing alters any form of physical existence whatsoever. Except that, upon receipt the physical phenomena cease to exist, just like they do if they hit a brick wall instead of an eye.
Paul