Baffling Orb Rings

I took the photos below on November 28, 2017 and November 29, 2017 while photographing nothing but pure, clean water drops falling against a dark background.  We see some of the strange things I call orb rings, which I have often photographed before (as shown here).  How these rings originate is dumbfounding -- if you ever try to use a needle to make a ring in a water drop, you will have no luck.