Dust again! One of the amazingly varied forms that a single speck of dust can take - they turn from specks to angular mountains, billowing sails, or fluffy clouds. This one’s darker, smoother, and sharper than most… my guess would be that it’s maybe a microscopic shard of glass. At 10 microns wide, it’s larger than most of the dust I’ve encountered - though 10 microns is only 0.01mm, so it’s still definitely microscopic.
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