树栖

树 = 对 + 木 : Sheldon Shrimp cultivates a Christmas tree in the space station's bathroom. He is very happy that he found the right tree, just the one he imagined, and—in his mind—marks of the tree he imagined with a big green check mark.

栖 = 木 + 西 : The Queen of Hearts (qi) set up an artificial habitat (栖) in front of the space station (Ø1) by using a huge cowboy hat (西) as the base on which she erected a few Christmas trees (木).