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Is there a name or more information about this strange common observation?
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November 4th, 2019
from iPhone
Do you know the springs that keep a door from slamming into the wall? They have a rubber cap. Cats and children like to activate them with a boingy twang.
But, I noticed, if you look at the spring, it sort of does something odd visually. I’m not sure just how many back and forths it takes for this shadow effect to occur that seems to leave the springs path from side to side still visible.
It’s interesting. I think the only thing that I can compare it to is how a fan blade essentially disappears while it spins. Maybe there is a relation.
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