木柴

木 = 八 + 十 : Mnemonic symbol: a Christmas tree.

Malte Monkey (mu) is setting up a Christmas tree (木) in the bathroom of the space station (Ø4). He decorates the tree with eight-balls (八) and puts a holy cross (十) at the top of the tree.

柴 = 木 + 此 : Charlie Chaplin (ch) found new boots (此) under the Christmas tree (木) in the airplane's kitchen (ai2) and is eager to try them out. He gets some firewood (柴), makes a fire and is amazed that with the boots he is able to walk over the fire. He is so amazed that he spontaneously walks all over the Christmas tree (like indicated in the character 柴).