The Pinyin final "an4" is used in the second half of Pinyin syllables. In MandarinBanana's mnemonic system, the second half of a Pinyin syllable is always represented by a location. You can visit the Pinyin index to see all Pinyin syllables from this mnemonic group, or to see all Pinyin syllables "an4" can appear in.
The background of the scene is a bathroom built inside a large, hollowed-out anthill structure, with organically curved walls made of tiny branches and other natural anthill material. A circular opening in the ceiling lets in natural light, creating a soft glow on the surfaces. In the center stands an oval bathtub with a white interior and an ant bathing in it, resting on small rounded feet made of the same earthy material. To the right, a simple white sink is mounted atop a tapered pedestal that blends seamlessly into the earthen floor.