估

估 = 亻 + 古 : Gitta Giraffe (gu) is working as evaluator in front of the space station (Ø1). She has to evaluate a cloister (古) in which Rosa Luxemburg (亻) is meditating because some investors want to change it into a luxury hotel. Gitta knows that Rosa will not give up the cloister voluntarily and thus estimates (估) that it is not worth to try and evict the cloister.

亻 = 丿 + 丨 : Mnemonic symbol: Rosa Luxemburg. She's quite radical, and her name starts with "r", just like "ren2". Also, 亻appears at the left-hand side of characters, and Rosa is a leftist as well.

Robinson Crusoe (r) and Rosa Luxemburg (亻) are having their favorite snacks in the encampment's kitchen: Rosa is eating a banana (丿) and Robinson is eating a dinosaur bone (丨).

古 = 十 + 口 : Mnemonic symbol: at least on German maps, this character actually resembles a cloister.

Oh no! Gitta Giraffe (gu) found that the golden cross (十) broke off of the cloister (古) in the space station's living room (Ø3)! She skewers a mandarin (口) on top of the cloister so that she can skewer the broken off cross back on to fix it.