The sharks disappeared as each wave rolled toward me; then a new wave would swell above the horizon, containing in it, like scorpions in amber, sharks that roiled and heaved. The sight held awesome wonders: power and beauty, grace tangled in a rapture with violence.

The Great Barrier Reef might be thought of as the ultimate “entangled bank.” Tens of millions of years of evolution have gone into its creation, with the result that even a fist-sized piece of it is unfathomably dense with life, crammed with creatures “dependent on each other in so complex a manner” that biologists will probably never fully master

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