蓝天
lántiān · HSK 6
blue sky
🔵☀️ lán = blue + tiān = sky/heaven — the blue ceiling above
蓝 (lán) means blue, 天 (tiān) means sky or heaven. Together they literally combine into blue sky. Think: lán sounds like land, and tiān like tea-en — the land under a blue tea-colored canopy overhead.
蓝 — grass radical 艹 + 監 (jiān, phonetic)
蓝 originally referred to the indigo plant used to make blue dye. The grass radical 艹 signals a plant, while 監 supplies the sound. Over time the meaning extended from the dye plant to the color blue itself.
天 — 一 (one/sky) above 大 (big person)
Originally a pictograph of a person (大) with an emphasized head, representing what is above — the sky or heavens. The top stroke evolved into 一, symbolizing the vast expanse overhead. From 'sky' it extended to mean 'day,' 'heaven,' and 'nature.'