周期函数

周 = ⺆ + 土 + 口 : Mnemonic symbol: a hula hoop. James II of England (zh) performs in front of the outhouse (ou1): he swings a hula hoop (周), juggles three mandarins (口) and balances a small heap of dirt (土) on his head. He cheated a little bit though, because he stapled the heap of dirt to his wig with a stapler (⺆).

期 = 其 + 月 : Recently the Queen of Hearts (qi) has become an astronomer. In front of the space station (Ø1) she sits on top of a watchtower (其) and watches the moon (月). From the moon's movement around the tower she wants to calculate its period and phase (期). She didn't consider though that not only the moon is orbiting around her, she is also orbiting the moon.

期 = 其 + 月 : Recently the Queen of Hearts (qi) has become an astronomer. In front of the space station (Ø1) she sits on top of a watchtower (其) and watches the moon (月). From the moon's movement around the tower she wants to calculate its period and phase (期). She didn't consider though that not only the moon is orbiting around her, she is also orbiting the moon.

函 = 丂 + 氺 + 凵 : Hamlet (h) is waterboarded in the anthill's kitchen (an2). He is trapped in a metal box (凵) wearing a breathing mask (丂) while being under a continuous stream provided by an aqueduct (氺). He is allowed to send one last letter (函) home, though.

函 = 丂 + 氺 + 凵 : Hamlet (h) is waterboarded in the anthill's kitchen (an2). He is trapped in a metal box (凵) wearing a breathing mask (丂) while being under a continuous stream provided by an aqueduct (氺). He is allowed to send one last letter (函) home, though.

数 = 娄 + 攵 : Sheldon Shrimp (shu) occupied a lunar mansion (娄) inside of the space station (Ø3) although he knows that it is to be torn down. Outside of his lunar mansion the construction (or rather destruction) workers are already counting (数) down from ten. When they count (数) zero, they will start taking down the whole thing with their sledgehammers (攵).