Some years ago, Colin McGinn decided to ‘turn [his] attention to fundamental metaphysics’. Though he had not ‘seriously worked on philosophy of physics before’ and had to ‘learn it from scratch’, he wanted ‘to think about the most basic categories of reality’ through ‘philosophical reflections on basic physics’ (p. 3). The volume here reviewed represents the fruits of these labours. His stated purpose is to communicate his insights on fundamental physics whilst taking seriously ‘the injunction to be clear to my colleagues who may not’ — unlike Prof. McGinn himself — ‘know much about the details of physical theories’; hence nothing in his book ‘should be baffling to readers innocent of the technicalities — no equations, no unexplained jargon, no mystification’ (p. 4). His basic thesis is that ultimately ‘a deep ignorance lies at the heart of physics, despite its formal richness’ (p. 5) so that...

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