I have a list of about 2,000 must-have posters. It's all in my head. Movies that I consider classics or classics in the making. I don't necessarily look for them, but I know what they are and I will consider my collection incomplete and a work in progress until I get them all, which means until I die or at least stop collecting. I already got a lot of them, probably half if not more, pieces like Vertigo, Breakfast at Tiffany's, Laura, to the much cheaper Godfather, Rocky, Apocalypse Now, to the Dark Knight Rises and La La Land. Some I will never get, like Casablanca. But it keeps me going, one piece at a time.
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