At a press conference on the eve of Mondrian. Evolution, a Piet Mondrian exhibition at Germany’s Kunstsammlung Nordrhein-Westfalen K20 museum, curator Susanne Meyer-Büser announced that New York City 1 (1941) has been displayed upside down since it was first seen in public, German publication Monopol reported Thursday. The first clue that the painting, an adhesive tape version of the similarly named New York (which hangs right-side up in Paris at the Centre Pompidou), was hung incorrectly came from a photograph of the artist’s studio in 1944, shortly after he passed away, the curator said at the press conference. In the...