三叠纪

三 = 一 + 二 : Mnemonic symbol: Cartesian coordinate system with three (三) axes. Socrates (s-) is performing in front of the anthill (-an1). He created an electrical flute by attaching a large capacitor (二) to the flute (一), so that he can get the attention of all the people. Moreover, he's balancing on a Cartesian coordinate system (三). Unfortunately, only three (三) people stop to watch the performance.

叠 = 冝 + 叒 : Dorothy Gale (di) finds the shelves (冝) in the elevator's kitchen (e2) are a complete mess. First she completely empties the shelves, piling up a heap of boxing gloves (叒) and another heap of cooking tops (冝). Then she proceeds to neatly layer (叠) the boxing gloves and cooking tops back into the shelves.

纪 = 己 + 纟 : Joan of Arc finds the space station's bathroom full of silken threads. She even cannot accomplish much using a butcher's hook. She knows that the silk worms are responsible and thinks that soon it will be the era of the silk worms.