So, partly thanks to its continuing patronage of a maverick like Curtis, the BBC maintains its cultural centrality, right? Maybe. But it surely won’t be lost on Adam Curtis that a film at least partially about the danger of echo chambers will reside, snugly ghettoised on the BBC iPlayer, to be viewed only by those already familiar with his work. Unlike his earlier, conventionally-broadcast films, it’s unlikely to confront an unwitting or indeed hostile audience with its scope and strangeness. As the world become more inexplicable, could we be about to enter an age of algorithmic inbreeding, where the emergent Netflix model throws up more and more variations on familiar minor themes for a captive audience and less and less that might startle or discomfort?