居安思危

居 = 古 + 尸 : Mnemonic symbol: 寄居蟹, ji4ju1xie4, a hermite crab.

A ghost is haunting Zeus and the hermite crab in front of the space station. While the hermite crab is able to retreat into the cloister it uses as shell, Zeus can only float away in horror.

安 = 女 + 宀 : Albert Einstein prepared an experiment: He invented a new sport and tries it out himself. Using a seat belt, he jumps off anthill's roof. To his surprise, he lands in a graduation cap that Bessie Coleman put there to capture him.

思 = 心 + 田 : Socrates is feeling blue in front of the space station. He's thinking of burying his heart under a field. When he finishes, he realizes that he has created some kind of small planet, with his heart at the center.

危 = ⺈ + 厄 : Mnemonic symbol: danger ahead sign.

There is a Greek nymph in front of the Eiffel Tower who goes around to seduce and devour all kinds of people. A crane has spotted her and flies around waving with a "danger ahead" sign to warn others, but Willy Walrus doesn't even notice: he spotted the nymph and instantaneously fell in love with her.

危 = ⺈ + 厄 : Mnemonic symbol: danger ahead sign.

There is a Greek nymph in front of the Eiffel Tower who goes around to seduce and devour all kinds of people. A crane has spotted her and flies around waving with a "danger ahead" sign to warn others, but Willy Walrus doesn't even notice: he spotted the nymph and instantaneously fell in love with her.