Monkey business experiment shows that we dont really notice a lot of what happens in front of us
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The monkey business experiement was a video of 2 teams passing a basket ball. observers were asked to count the passes. half way through the video, a gorilla walks through the crowd of players. About 50% of people dont notice the gorilla.
Dont believe we have noticed everything
Consider seemingly impossible scenarios.
Consider what lies behind the scences.
Pay attention to the silences as much as the noises.
Check the sides, not jsut the center.
Sometimes the unnoticed is as huge and distinctive as teh gorilla.