4 I would certainly done a number of things differently as regards the presentation of material had I started this project from scratch: the chapter on gauge theoiy I would have reframed in the language of fiber bundles; the chapters on the hole argument and observables I would have considered from the perspective of the Kretschmann objection and the ongoing debate concerning general covariance, diffeomorphism invariance, absolute objects, and background independence. However, though these are indeed notable absences, I think the book manages to hold up despite them.

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