When I walked up to Nahmad Contemporary, the young dealer Joseph Nahmad's gallery inside the art world citadel of 980 Madison, the door was locked. When a gallery assistant finally came to let me in, the inside of the gallery was dark, all the lights off, just a faint pink shade floating through the room. And when my eyes adjusted, it became clear the entire main space was empty of art to exhibit. There was just wall text announcing the exhibition: "STILL LIFE: Dan Flavin | Alex Israel"