Photo date: November 4, 2019. Photographer: Mark Mahin.
I took the photos below while photographing only ordinary drops of pure, clean water falling in front of a black featureless background. We see four orbs that all had the same strange motif at their bottom, a motif consisting of three parts: a rectangle shape, a circular shape, and a partial oval shape.
We see more cases of the same motif in the photo below: