古昔

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.

昔 = 井 + 日 : Mnemonic symbol: From 奶昔, milkshake

In former times (昔), at the end of the day the sun (日) used to go down in a well (井) in front of the space station (Ø1). Xi Shi (xi) made the sun go out by pouring a milk shake (mnemonic symbol for 昔) over it.