Georgina
"it is not the receipt that makes it a reality interface but the change that it facilitates"
Er, but there has to be receipt for that change, subsequently, to happen. The interface is the physical interaction between that which was received and that which received it, not what happened later. Neither is it a change, in the sense that it altered physical form. On being received, what was existent, in terms of being usable by a sensory system, just ceased to exist. And that is exactly the same, whether it was received (ie was in the line of travel with and interacted with) a brick or an eye.
"It changes meaningless bits of information into potentially meaningful output"
Not so. If received by the appropriate entity, then some aspects of the received physical input are processed into a perception of what was received. Physically, it is what it is. Reception is irrelevant.
"Now it seems your "physically existent representations" are just light anywhere and not just light received by a sentient organism.
Obviously. I am not sure where the "now" comes from. I have always said that. It is not 'potential', in the sense that there is some difference. It is an independent, physically existent, representation of what occurred. Whether received or otherwise, and whether received by an entity which can process it or otherwise. Whether you can "liken it to a wave function" or not , I do not know. And what the purpose of so doing is, I do not know either. Of course, I could ask, what is a wave, which has caused people problems when I have asked before, but will refrain from doing so, as this is a side issue.
Re your second post. The extent to which any given light remains in its original form is an entirely different issue. Light is just an existent entity. It is therefore susceptible to influence during its existence. However, the indications are that the physical aspects which can be utilised, if received, do not change, or very nearly so. Apart from anything else, as I said in a post to Rob, if that did, then the sensory system of sight would not have developed in the first place, because it would be useless. As the physical input would be completely unreliable as an indication as to what is happening.
I am fully aware of what Einstein did wrong (ie conflated reality and light reality and did not understand timing), and therefore what is wrong with the concept of relativity. There are no paradoxes, the concept is incorrect.
Paul