陰
かげ · kage · JLPT N3 · noun
shade
🌳 阝 hill + 今 now + 云 cloud: the hillside the clouds cover now is in shade
陰 is the yin of yin-yang, and it first meant the shady north slope of a hill. That is where the sense of the other side comes from. As a sound hook, kage sounds like cage: the bars of a cage throw strips of shadow.