Extreme close-up of a single speck of dust.  It turns out that dust comes in all shapes and sizes, and this cloud-shaped piece is a rarity - I’ve also found mountains and sails and lumpy monsters.  None of which are supposed to be there… but when I take my samples out of the cleanroom to image them, I have to expect dust.  This speck is small - the bar at the bottom of the image is only about 1/100 the width of a typical human hair.

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