The word "大海" is formed through a direct and intuitive conceptual combination of two meaningful characters. The first character, "大" (dà), carries the core idea of "big" or "vast". The second character, "海" (hǎi), embodies the fundamental concept of "sea". By placing them together, the concept of "bigness" is applied directly to the concept of "sea", merging visually and semantically to create a single, unified idea that specifically denotes the "great sea" or "ocean", evoking a sense of immense scale and openness beyond a smaller or ordinary body of water.