My eyes can't resist twirling things. Not so much desk fans, because they're too fast and just blurry, but ceiling fans entrance me. When I'm out in the countryside, I really like to watch wind turbines, sycamore seed "helicopters" falling from their trees, or flotsam spinning around in the eddies of a stream. Watching washers and driers spinning used to be good too, back in the days when I had to do my laundry at the launderette.
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When you are fighting an invisible monster, first throw a bucket of paint over it.