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There’s a reasonably famous experiment on perception in which people are asked to watch a short clip of a basketball game, and count the number of times that the players in white T-shirts pass the ball. After watching the video, the viewer is asked one very simple question:
"Did you notice the gorilla?"
Because a gorilla walks through the shot, about halfway through the video. It even stops and does a little dance. And you know what? Nobody does notice the gorilla. Once we’ve decided what (...)