FOR most of the last decade, the watch industry has been entranced by the tourbillon’s hypnotic revolutions, with brands spinning out the cagey little complication in ever-greater numbers and more ingenious ways. But watchmakers have recently broken free of the spell, shifting their attention from the visual fascination of the tourbillon, which aims to counter the effects of gravity on a timepiece by mounting the watch escapement and balance wheel in a rotating cage, to the tuneful appeal of th…