自变量

自 = 丶 + 目 : Mnemonic symbol: a hand mirror, which someone uses to look at themselves.

The Eye of Providence (目) is looking at itself (自) in a handheld mirror (自) in the space station's bathroom (Ø4). It think it's indeed looking very good, since Zorro (z) attached a petal (丶) to its eye (目).

变 = 亦 + 又 : In anthill's bathroom the also-ran is sparring with Brunhilde. In her mind she imagines changing into a boxing grizzly bear.

变 = 亦 + 又 : I think 变 does look like a grizzly bear with a beret. 又 is the snout, and the two eyes are the two strokes of 八.

量 = 旦 + 里 : Li Qingzhao uses a measuring cup for a recipe in the anglepod's kitchen. Unfortunately she made a terrible mistake: instead of measuring cups of sunflowers, she throws sunflowers and cups together into a measuring cup.