Hal
"only one immediately observable universe that is extent at any time"
Yep, I remember that, but then you started talking about the mind and the lack of an objective reality! Just to make sure we are saying the same thing via that sentence, I would comment:
a) potentially observable, ie it is there but our chances of seeing it all are zero,
b) sensorially experienceable, rather than observable, ie the point relates to all forms of senses of all sentient organisms not just humans and sight,
c) the word universe which is an alternative to physical reality (or physically existent state) would need clarification in that it includes the physical phenomena received by the senses, which are physically existent in themselves and in the context of the sensory systems are a representation of what is normally referred to as reality, which is that what existed and caused the phenomena received due to an interaction
d) any given point in time, rather than just any time, in order to stress the point that in order to identify what was physically existent differentiation must be pursued until there is no 'time' left for any change to occur.
"However, there are no objects, in a classical sense, upon which this reality is based"
I agree with this, and did before, but I suspect for different reasons(?) In order for there to be physical 'presence' there must be 'objects', and by definition, these must be constituted by something (objects) that is elementary (ie not further reducible, there may be more than one type of these). However, while these 'objects' constitute the substance of physical reality, they cannot be equivalent to a physically existent state, ie what existed. Because these 'objects' have 'properties', and change occurs, they do not exist in a constant state. And in order to define physical existence, we need to identify one such state, which as I have said before is probably impossible, but that is another issue. However, I suspect that a number of 'objects', as conceived, do not actually correspond with their conceptual representation.
Paul