Illustrating this post required some undercover work. I had the idea to write something about Wolfgang Amadeus Mozart’s Serenade for Winds and Strings in D major “Posthorn” (KV 320) since last year’s summer. And I knew that many years ago, postmen in Luxembourg wore caps with a posthorn. Nowadays, they wear basecaps with a modern logo that has no charm at all. So where could I get a picture of such a cap? The post museum was one option, but all the stuff is exhibited behind protective and reflecting glass.