Happenstance: “Chance or a chance situation, especially one producing a good result” ... Photography: "the art or process of producing images on a sensitized surface by the action of radiant energy and especially light"
One of the disappointing things about microstock is that we seldom know where are images end up, or what they're being used for. But every once in a while we find one. I was recently doing some poking around, using a little program called Tin-Eye, and I discovered one of my images being used as a book cover!
I don't know for sure, but I think the image was bought from iStockPhotos. Possibly from Shutterstock:, the image is available at both places. Here's the original: