hmm its a hard thing to do to pick a favourite film, yeah there are films that are great for their imagery or concept. But for me when it comes down to it, great films speak about the human condition, something that everyone can relate to and oddly enough these kinda films tend to be quite simple in narrative. One of my fav examples of this is Ikiru a kurosawa film from 1952.
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http://www.imdb.com/title/tt0044741/
Also up there: