Nina Beier, The Demonstrators (Sinking Bulb), 2011. Frames, posters, stock images. Photo: Anders Sune Berg. On view at Kunsthal Charlottenborg through Dec. 31.

Robert Heinecken, Lessons in Posing Subjects/Matching Facial Expressions, 1981, 15 unique SX-70 Polaroid prints mounted in Rives BFK paper, letterpress title and text, 15 x 20 inches. On view at Friedrich Petzel New York through Dec. 22.

Klara Liden, Untitled (Down), 2011, C-print. On view at Galerie Neu, Berlin, through Dec. 10.

Neo Rauch, Türme, 2011, Oil on canvas. On view at David Zwirner, New York, through Dec. 19.

Martin Kippenberger. Untitled from the series Dear Painter, Paint for Me. c. 1981. Synthetic polymer paint on canvas. © 2011 Estate Martin Kippenberger, Galerie Gisela Capitain, Cologne. On view at MoMA without announced end.