The Chinese word **蓝天 (lántiān)**, meaning "blue sky," is formed through a straightforward and common compounding process where two independent characters, each with their own meaning, are combined to create a new, specific concept. The first character, **蓝 (lán)**, is a morpheme meaning "blue," acting as a descriptive adjective. The second character, **天 (tiān)**, is a morpheme meaning "sky" or "heaven," serving as the noun. When placed together in this modifier-noun structure, they create a precise and vivid nominal compound that directly denotes "a sky that is blue." This method of formation is highly typical in Mandarin, allowing for efficient and logical creation of vocabulary by pairing semantic elements.