‘云烟’ literally combines ‘cloud’ (云) and ‘smoke’ (烟), evoking hazy, drifting vapors that blur outlines and dissolve form. It describes natural mist or fog—especially over mountains, rivers, or lakes—where water vapor and light create soft, ethereal veils. This visual quality makes it a staple in classical Chinese poetry and landscape painting.

Beyond its physical sense, ‘云烟’ carries strong poetic and philosophical connotations: it symbolizes impermanence, fleeting beauty, or illusory phenomena—things that appear vividly but vanish like mist. It’s rarely used in casual speech; instead, it appears in literary writing, idioms (e.g., 过眼云烟, ‘passing like clouds and smoke’), and formal descriptions of scenery or emotion. Its tone is elegant and contemplative, often implying quiet melancholy or Zen-like detachment.