Do you believe in ‘dust particles’? This was just after I turned off the lights to go to work. There’s no fan, heating or A.C running. I’ve had seen some blinking/twinkling across the room. The first night, one came down out of the ceiling above my head. Didn’t have an SD card yet.
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I get quite a few of these floating dust spots in my garage shortly after I pull my car in and “get the air stirred up”.
If you have ever been in a barn with a crack between boards, or a knot hole that allows a sun beam to go through where the rest is relatively dark, it is surprising how much dust there is in the air all the time, that you don’t notice until the lighting conditions are right.