Photo date: January 6, 2020. 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. On this day in hundreds of photos I got a pattern I may describe as a "bitten doughnut" motif, as it looked rather like a doughnut which someone had taken a bite out of. Below are some examples. Notice that in each case the "doughnut bite" is at the bottom.