Two figures, one upright and one flipped — a person turning over, becoming something else. The purest picture of transformation in the whole script.
变化 change, 文化 culture ('transformation through writing'), 化学 chemistry ('the study of transformations'). Modern Chinese bolts 化 onto anything to make '-ize': 现代化 modernize, 绿化 green-ify.
One person upright, one flipped — TRANSFORMATION.
化 is the suffix engine of modern Chinese: globalization 全球化, digitization 数字化 — new '-izations' are coined weekly.