‘Light & Magic’ charts the visual-effects revolution from ‘Star Wars’ to ‘Jurassic Park’

“Light & Magic” is of course a trip down memory lane about movies people love (beginning with “Star Wars”) and the wizardry behind making them. Yet this six-part docuseries from Lawrence Kasdan, a veteran of that franchise, also contains a broader look at how technology can fundamentally reshape an industry in a way that can put even ingenious buggy-whip makers out of business.