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Azzam
Time
The analogy of reality and a film is correct. Reality is a sequence of physically existent states, each of which, by definition, exists for a point in time (as in timing). This is so because any alteration in any given physically existent state constitutes a different reality (physically existent state). Only one state can exist at a time. Or put another way, that state was the present (existent) as at that point in time. So, 'time', as such, does not exist. 'Things' (technical term!) exist, and change occurs. That change occurs at a rate. That is the physically existent phenomena which corresponds with the concept of time, ie rate of change. The quantification of this (known as timing) involves the comparison of these rates, either directly, or with respect to a common denominator. We use devices for this known as clocks/watches. If it is a quartz watch, for example, what is actually being measured is that X occurred whilst a crystal oscillated n times. Movement/motion (which is comparative alteration in spatial position) is but one example of change. There may be other primary properties, which, for some reason(s) are caused to alter.
Observer
The processing is irrelevant, in that it is what is received by the observer, or indeed any organism effecting any form of sensing, that needs to be identified. What is received is physically existent, and is the result of an interaction between the reality (a physically existent state) and one of a number of physically existent phenomena (which was in a particular existent state as at the point of interaction). The observer, or hearer, or feeler, etc is, in physics, no different from a brick wall. That which is physically existent and is received by the organism is only 'information' because organisms have developed sensory detection systems which can process it, brick walls have not. Obviously (unfortunately!) we only have the output of this processing from which to discern what physically occurred. And that has two components:1) that which occurred (was physically existent at a point in time), 2) that which occurred as a result of an interaction with the latter, which while undergoing alteration (ie its physically existent state changes), from the perspective of sensory systems, it retains certain physical features. These exist in multiple numbers and over considerable durations, even though they only 'represent' (in the context of sensing) one existent state of the reality under consideration. These phenomena are commonly referred to as light, noise, vibration, heat, etc.
The above then explains all that follows. In very simple language: there is a physical occurrence, this interacts at the point in time of this occurrence with other physically occurring phenomena, thereby creating other physically existent phenomena, which, if an organism is in the line of travel, will subsequently be received. The recipient can have no effect on anything, because it is receiving, ie existence has occurred. And indeed, what it is receiving is not the reality.
Light
As I have already said in other posts, light is just a physically existent entity which is moving. Calibrating its speed is purely a matter of comparing change in spatial poison. The fact that it enables organisms to 'see' is irrelevant. The word 'frame' is concerned with reference. There has to be one in order to effect a comparison and thereby calibrate the attribute. Any frame is valid. However, having chosen a frame that must be used consistently. Light just has a constancy in that it always initiated at the same speed, will continue at that speed unless impeded in some way, and is independent of 'observer'. Their hypothesis was that matter actually altered in one dimension. SR involved no altering form of motion, and there was no dimension change in it.
Paul