Longtime New York art dealer Achim Moeller is opening a new gallery, called Moeller Fine Art Berlin.  The gallery’s opening exhbition, "Ouverture" opens on April 28 and includes work by many contermpory artists as well as masterpieces by such artists as Marcel Duchamp, Paul Klee, and Wasilly Kandinsky.   The exhibtion will be shown in Palais Eger, a Beller Epoque  palace in Berlin.