冰是睡着的水水是躺着的冰
[bīng shì shuì zhe de shuĭ shuĭ shì tăng zhe de bīng]
This nickname suggests that ice is dormant or sleeping water, while water is reclining or resting ice. It conveys a whimsical perspective on the states of water, hinting at change and cyclical nature of things.