Striped Orbs Are Puzzling

Photo date: December 8, 2015. Photographer: Mark Mahin.

The photo below was taken while photographing nothing but ordinary drops of pure, clean water falling against a dark featureless background. We see an example of one of the many types of weird things that appear in my photos of this type: a pair of striped orbs.

Another photo from that day showed the same thing.  They almost looks like clams.

See here for 16 other photos of such striped orbs.