The Palace at 4:00 AM by Alberto Giacometti, 1932. Wood, glass, wire, and string, 25 x 28 ¼ x 15 ¾ inches. The Museum of Modern Art, New York City.

From the MOMA page:

According to Giacometti, The Palace at 4 a.m. relates to “a period of six months passed in the presence of a woman who, concentrating all life in herself, transported my every moment into a state of enchantment. We constructed a fantastical palace in the night — a very fragile palace of matches. At the least false movement a whole section would collapse. We always began it again.” The woman in question is often identified as one of Giacometti’s lovers, known only by her first name, Denise. In the summer of 1933 Giacometti told André Breton, the leader of the Surrealist movement, that he was incapable of making anything that did not have something to do with her.

Click here to listen to an audio description of the work from the Museum of Modern Art.