Here’s something you couldn’t do in theaters: Thanks to the magic of streaming video, you can watch Richard Linklater’s hyper-praised experiment in chunks. You’re meant to take it in one big glop, let the 12 years in the life of a not-so-average Texas kid (Ellar Coltrane) — which was, of course, filmed over 12 years — wash over you like a cosmic head trip. Or you could stop at the end of every year, take a big break, then switch on the next bit. Each time our hero — and his parents, played by Patricia Arquette and Ethan Hawke, plus his sister (Linklater’s own daughter, Lorelei) — will have aged just a bit more. You’ll even be able to focus on the details of each episode, rather than speeding through it. You don’t necessarily have to take 12 years to watch it; after all, thanks to the fickle nature of Netflix rights issues, “Boyhood” will probably be gone from their realm in a month anyway.