My wife owns a kaftan which she wears around the house. On the day I took this photo it had been washed and was hanging on the line and the sunlight was shining on the patterns on the back of it. I took a photo of the patterns, cropped out this one (which reminded me of a parasol) and subsequently converted it to black and white.

Funnily enough, when I showed my wife the final image (as you see it) she vaguely remembered the shape, but couldn't quite remember where she's seen it before :-)))