Blue Shadows, Missoula, Montana

There's a song for everything, if you've been paying attention.
The blue of these shadows provoke - to my mind, at least - "I'm being followed by a moon shadow...". 
I know, I know, we're looking at sun shadows, and the verse lyrics are on the sinister side, but it's a catchy chorus - which I'm sure you'll sing repeatedly, all afternoon, in random snippets, when you're trying to finish something important.
You can thank me in person when you come to visit.