尘世

尘 = 土 + 小 : Charlie Chaplin (ch) enters the encampment ((e)n2) as a vicious dust storm (尘) is blowing. He breathes so much dirt (土) that he thinks the dirt got even into his heart (小).

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.