The secret numbers that unlock thousands of hidden films and TV shows.
Netflix's incredibly niche, personalised subgenres have long captivated movie nerds, from "Steamy Crime Movies from the 1970s" to "Period Pieces About Royalty Based on Real Life".
The genres, based on a complicated algorithm that uses reams of data about users' viewing habits to recommend exactly what a particular user is into, number in the tens of thousands.
Netflix normally shows only a limited number of categories, based on what the service's algorithms believe a specific user might like.
When Netflix thinks you'll like sentimental Spanish-language dramas or gritty tearjerkers, they'll show up on your home screen, but aside from that, they're not easy to find.
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