其外

其 = 目 + 八 : Mnemonic symbol: the shape of 其 looks like a watchtower. The Queen of Hearts (qi) is on lookout on the watchtower (其) in the space station's kitchen (Ø2). The Eye of Providence (目) helps her to look out for intruders. They also spread some eight balls (八) for possible intruders to trip on.

外 = 夕 + 卜 : There's a hole in the wall of the airplane's bathroom (ai4), and from outside (外), a bat (夕) wants to enter. Willy Walrus (w) is very afraid of bats, so he does his best to hinder the bat from entering with a voodoo staff (卜).