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This is an old photo but I think it's kind of interesting. And I haven't seen anything like it since. I'm not sure whether the tiny insect (aphid?) is on the inside or outside.
Who made this sack?
Any info on this "thing" is very welcome!
Left photo is taken without flash, the right one is with flash.

Size: ~1-2cm
Date: 04 November 2007
Location: Hanging on the underside of the wooden railing around the pond (Helsingborg, Sweden)

Thanks!