I’ll go all arbitrarily subjective and complainy on this topic and take the opportunity to point out that in recent years I’ve been a little disappointed by Apple’s choices in many of the nature photographs. They’re beautiful images, but whoever chooses them seems, to me, to lean toward composition that draws the eye to the foreground of the image and to the center of the screen. I like the dynamic images, but that one with the sand dune always bugged me. I felt like it was blocking the vista behind it, which is what I really wanted to see. Even the top one you’ve posted here has that little notch of land near the middle trying to steal focus from the sky and horizon. I’d prefer my widescreen desktop picture to be sweeping and vast, with a little rule-of-thirds thrown in, rather than centered and foregroundy, thank you very much.