Can't speak for the blinds, but I've seen odd shapes & lights in the sky as well that were completely silent. Travelling from northwest to southeast, about 8 or 10 of them overhead in a rough V formation, glowing sort of a yellow-orange.
Kinda freaked me out, actually. Took me ages to figure out what it was.
It was a flock of Canada geese flying south. Their white bellies were reflecting the light from the streetlights.
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