13 December 2009 54 8K Report

...and how does it fit in with such notions as "existence"?

For the religious believer, the object of their belief is "real". For certain scientific realists, elementary particles are 'real' (or express 'real' relations). For the anomalous monist, "mind" is real. For most of us, the distinction between 'past', 'present', and 'future' is "real".

"Reality", in the sense sought by this group, would seem to be the totality of "what is real", yet the definition of "what is real" (either in extension or in intension) depends on a given epistemic system.

So, perhaps our first task is to give the "universe of discourse". Are we talking about "reality" within physics? If we are, what exactly do we mean by "reality in physics"?

The question of the "reality" of fundamental entities, and their relation to the macrolevel phenomena which constitute our experience, has been dealt with by various people (from James Ladyman to Craig Callender). But what are our criteria for preferring a bottom-up account of reality? Is it merely a preference for what David Lewis called "Humean supervenience", and if so, why should we have a preference for parts over wholes? If it isn't, how can we found the priority of the "fundamental level"? Is this priority ontological, metaphysical, or epistemological?

Can we make sense of a "top-down" account of reality? I must admit that, as a philosopher, a top-down account makes rather more sense than a bottom-up account, but I'm constantly reminded that our perspective on the world would seem to be "from somewhere around the middle". This last remark founds what I feel to be the real problem: to what degree are our various accounts of the world based on the generalisation of entirely local conditions?

(This last remark would be trivially illustrated by someone who thought that "weight" was a universal rather than local property)

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