不可通約

不 = 丆 + 卜 : Bruno Bear (bu) is setting up a wind wheel (丆) with a voodoo staff (卜) in the space station's bathroom (Ø4). He also puts a "forbidden" sign (mnemonic symbol for 不) on it, to make clear that it may not (不) be stopped.

可 = 丁 + 口 : Karl Marx (k) is challenging his abilities (可) in the elevator's living room (e3). He tries to force a nail (丁) into a mandarin (口), just by using his head. On top of that he tries to do so one thousand times, in order to create a bed of nails (mnemonic symbol for 可).

可 = 丁 + 口 : Alternative mnemonic symbol: kebab, from the pronunciation "ke". Karl Marx (k) is preparing a kebab (mnemonic symbol for 可) in the elevator's living room (e3). He also skewers mandarins (口) on the long steel nails (丁) and will only allow (可) his guests to eat the rest of the kebab if they eat their mandarins first.

通 = 甬 + 辶 : In front of the engine a pile of yongzhong bells were blocking the way. Tommy Turtle attended to the matter and cleared the way. He lined the bells up to two lines, put on his gladiator sandals and now marches right through this path screened by walls on two sides like a roman general.

约 = 勺 + 纟 : Marilyn Monroe is on a date with a silk worm in front of the elevator. Marilyn wants to show the silk worm around, and so she carries him around on a little silver spoon.