If you look at normal everyday objects for too long, they start to look odd. Many commonplace items we come into contact with on a daily basis are so normal that we don’t even think about their existence.
Take, for example, a doorknob. Everyday we walk through doorways and use doorknobs. If you stare at one for a while and think about it, you start to notice that it actually exists. Sometimes it will come as a shock to you that you’ve never noticed it before, kind of like when you see the names of the states written on the top edge of the Lincoln Memorial on a five-dollar bill.
If you think about about the doorknob even more, you might realize how interesting the mechanics of it are, and how a simple turning motion can determine the mobility of the door on its hinge. Or you might realize that you spent a significant chunk of time thinking about doorknobs and wonder what you were doing before.
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