Dear Paul,
You are right in many respects. There can be different opinions and all may be correct in there own right. Statement 'But the reality we can scientifically establish is only what we can know of it' to me is an opinion.
I consider, when we are not certain about the location of object, there is nothing we can know about. In PicoPhysics, the uncertainty principle expression spatial boundaries with-in which we shall find the object. They are not expression of probability of finding the object at a point.
This makes PicoPhysics a deterministic theory Vs Quantum mechanics which is considered statistical or theory of chance (Probability).
Elephant is an interesting analogy. First it means the observer already knows what an elephant is. Elephant by itself does not exist - it may have died, body burnt or decay with decomposed into nature etc. It is constituents at core - complex organisms->molecules->elements->elementary particles->Knergy. Thus finally it is Konservation that answers existence of all objects as complex reality of nature.
It is also possible for observer to extrapolate an observation (say the shape & structure of teeth) to say it belongs to a particular elephant. In addition, a limited inspection of patterns on his ears to predict it is an identified living elephant. These conclusions of observer draw on so many other processes and Knowledge that they do not seem relevant when discussing foundations as we want to think in simple terms of cause and effect logic.
You are right, we need to scientifically establish reality. It again has many facets to it. But theoritical & experimental work is many times related to reality that is already established scientifically. For example the reality that is experimentally established is signal over noice ratio at 5-sigma level when 2-3 Tev protons collide in 120Gev range. We have an existing formulation, that conceived Higgs Boson if they exist will lead to similar results. Joining the two is in process. I differ with respect to postulating Higgs Boson as a particle irself. But people will have different opinion.
When we say scientific established reality, I belive we are at a state where we need to re-visit scientifically established facts and determine the weekness in the arguments or determinations made in ignorance in the past. May be, if higgs boson become a scientif fact of nature we may need to re-visit them as well.
Thanks and Regards,
Vijay Gupta