中国作协

中 = 丨 + 口 : Mnemonic symbol: a dart board, because you always try to hit the center.

Julian Giant Squid (zhu-) is throwing dinosaur bones (丨) as darts on a dart board in front of the engine ((e)ng1). To make it a bit more difficult he's throwing mandarins (口) into the air as well and skewers them up right in the center (中 is a mandarin skewered on a dinosaur bone) in mid flight with the dinosaur bones. He's still able to consistently hit the center (中) of the dart board.

国 = 囗 + 玉 : Mnemonic symbol: a nation's flag. Let's say the Chinese flag.

In the observatory's kitchen (o2) Gitta Giraffe (gu) is practising her ballet performance. She got a whole crate (囗) full of jade bracelets (玉) and flags (国) and fixed one flag to each jade bracelet. This makes a perfect combination for throwing the ring with the flag waving behind it and catching the ring again after a few pirouettes.

作 = 乍 + 亻 : Rosa Luxemburg and Zapatista Zebra are high-fiveing in the observatory's bathroom because they're growing so awesome Mohawk haircuts.

协 = 办 + 十 : Marie Curie (xi) announces her new cooperative society (协) in the elevator's kitchen (e2). She wants to give crosses (十) to the poor. In reality her society is nothing more than a scam business (办): the crosses cost a lot of money.