Contra Metaphysical Idealism

[bennyboy]

And that is something entirely without evidence or possible mechanism. Where do these 'concepts or ideas' reside? All you seem to be doing is restating Platonism.

Platonism posits an EXTRA layer of reality. I certainly don't intend to indicate that. I suppose you could say idealism means we're living in Plato's third world exclusively.

Where do elemental concepts or ideas reside? Where does the universe reside? Where does God reside? When you are stating a brute fact about the underlying substance of things, there's always the lurking appeal to infinite regression or to paradox. "Given system X, what underlies it? System Y or nothing. If system Y, what underlies it? If nothing, then what is the magical mechanism by which is it self-existent?"