朔
=
屰
+
月
:
The moon (月) wants to use the bathtub in the observatory's bathroom (o4), but Sheldon Shrimp (shu) has been using it all day and it doesn't seem like he'll finish any time soon. The moon angrily tells Sheldon to get out, but Sheldon disobeys (屰). Finally the moon remembers that it is the first day of the lunar month (朔), so he causes a spring tide (朔) which washes Sheldon out of the bathtub (and out of the bathroom) so that the moon can finally take a bath.