re: Question regarding the end of Shawshank Redemption

quote:

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Only the top two corners were probably secured. The poster would just naturally lie correctly due to gravity.

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This. They even showed it in the flashback montage with Red's voiceover. He was digging into the wall with the poster draped over his head and the top of it taped to the wall. Then he peeked out from under it to check if a guard was coming. It was clear as day.