This one I can't explain.
Take a look at the center of this snowflake, and you'll see two near-perfect circles. I did not put these here, they exist in the RAW files. You can see a raw file from this focus stack to confirm this:
Water creates hexagonal crystals, as far as I know this can't happen. I was using a ring flash for this shot, but these circles are unbroken - they would be semi-circles if they were caused by the flash.
I am no physicist, but this phenomenon doesn't seem possible with my limited knowledge of such things. Can someone chime in with some more information?
- Don Komarechka