Open this photo in gallery: Warsaw’s new museum of contemporary art, a three-storey complex consisting of a long rectangular block and a free-standing tower, is a mass of pale poured concrete inside and out.Photographer: Marcin Czechowicz/Supplied In the middle of Warsaw is a vast, empty space: Parade Square, which hosted Cold War displays of military might and Soviet cheer. Now that zone is filling up with art. MSN Warsaw, the Polish capital’s museum of modern and contemporary art, has opened a new building here that makes a radical break with the past. The new MSN, by American architects Thomas Phifer...