普世

普 = 並 + 日 : Mnemonic symbol: 斯普特尼克, Sputnik the satellite.

Petra Penguin is really angry at the sun for heating up earth's poles. In the space station she tries to kill the sun with a combine harvester, but the sun defends itself by flinging Sputnik replicas at Petra.

世 = 廿 + L : Mnemonic symbol: the WTO or WHO.

Sherlock Holmes (sh) is cleaning a flower pot (廿) under the shower of the space station's bathroom (Ø4) with a loofah (L) because he didn't quite understand a poster next to the shower from the WHO (世) explaining dangers arising from different germs.

In this case, L is for loofah.