Every so often, things just "click" and a really good image appears. This was one of those times.
The wallpaper version is available at the preceding link.
Today's Gratitude Item: That most technical problems can be solved by googling. I was working on an Indesign file and when I tried to place a text box over an image, the text disappeared into overflow. Googling told me that all I had to do was tell the box to ignore the text wrap. I would never have figured it out without the world's favourite search engine.