That's just your brain filtering the information differently. It's the same thing when you buy a new car. 'Suddenly' you see this model everywhere. It's not like they haven't been there before, it's just that you didn't notice them because they had no special value for you. That changed, now they have.
Or when you've got a new favorite song. 'Suddenly' you hear it 'everywhere'. Or a new favorite subject, etc ...
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