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).
库
=
广
+
车
:
Karl Koala (ku) ordered a new cabriolet (车), and it's going to be delivered to his garage (库) in the space station's bathroom (Ø4). The new cabriolet is being thrown off suspended from a parachute (广), but unfortunately it hits the garage with Karl's old car and smashes it.