An "Avacado and Egg" Pattern

 Photo date: February 11, 2021. 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 a two-part pattern that persisted through almost all of two hundred consecutive photos.  The left part of the pattern resembles the shape of an avacado, and the right part resembles the shape of an egg.