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7. Existence / C. Structure of Existence / 3. Levels of Reality

[reality has a structure of interdependent levels]

6 ideas
If observation goes up a level, we expect the laws of the lower level to remain in force [Wilson,EO]
One location may contain molecules, a metal strip, a key, an opener of doors, and a human tragedy [Lycan]
Biologists see many organic levels, 'abstract' if seen from below, 'structural' if seen from above [Lycan]
There are levels of organisation, complexity, description and explanation, but not of reality [Heil]
A higher level is 'supervenient' if it is determined by lower levels, but has its own natural laws [Heil]
A necessary relation between fact-levels seems to be a further irreducible fact [Lynch/Glasgow]