Inexplicable Triangles Above Mysterious "Mushrooms"

Photo date: January 29, 2017. Photographer: Mark Mahin.

I took the photo below while photographing nothing but ordinary drops of pure, clean water falling against a dark featureless background.  We see two very strange things .At the top is a cluster of triangle shapes. At the bottom are three mushroom shapes.

I have several times before photographed these strange mushroom shapes in drips of water, most notably in the photo below (from this post), showing a remarkable "golden mushroom."