张三李四

张 = 弓 + 长 : Mnemonic symbol: a spreadsheet. James II of England (zh) practices his archery skills in front of the anglepod (ang1). Riding on a longboard (长) he shoots arrows using his composite bow (弓) trying to hit a spreadsheet (张).

三 = 一 + 二 : Mnemonic symbol: a 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 ants. Moreover, he's balancing on a Cartesian coordinate system (三). Unfortunately, only three (三) ants stop to watch the performance.

李 = 子 + 木 : In the space station, Li Qingzhao shakes a Christmas tree which is decorated with eggs. The eggs fly off and as they break open, plums fly out of them.

四 = 儿 + 囗 : Mnemonic symbol: a four-leaved clover. Socrates (s) is working out in the bathroom of the space station (Ø4). He's lifting four (四) wooden boxes (囗), and wonders why they are so heavy. He doesn't know that inside one of the four boxes, the monkey king (儿) is hiding and secretly laughing at him - until the monkey king comes out and surprises Socrates with a four-leaved clover (四).