大小便

大 = 一 + 人 : The big (大), huge (大) robot (mnemonic symbol for 大) is working out in the ashram's bathroom (a4). He's lifting a flute (一) to which Don Quixote (d) and Neanderthal man (人) are clinging.

小 = 八 + 亅 : Mnemonic symbol: a small daisy. 小 looks like the stem 亅 of the flower is pushing aside the earth 八 as it grows out of the seed in the ground.

Xi Shi (xi) is decorating her hair with lots of small (小) daisies (mnemonic symbol for 小) in the aorta's living room (ao3). She wants to have lots of daisies in the future as well, so she plants new daisies. She found that the perfect substrate for planting daisies is made by crushing eight-balls (八) with a crow bar (亅).

便 = 亻 + 更 : "Handy" is a German word for "mobile phone", so that's what I will represent this character with.

便 = 亻 + 更 : Brunhilde lost her mobile phone! When Rosa Luxemburg helps her to find it by calling Brunhilde's phone, they discover that it must be inside the snake that ate an elephant which is lying in the anthill's bathroom. Together they open the snake's mouth to see wether they can find it.