Final answer:
Claude Debussy's 'La Mer' is a musical piece about the sea, depicting its qualities and interactions with nature through impressionistic sound.
Step-by-step explanation:
Debussy wrote his piece, 'La Mer', about the sea. This orchestral work is an impressionist painting in sound, capturing the essence, mood, and atmosphere of the sea - much like his contemporary, Monet, captured light in his paintings. 'La Mer' is structured in three symphonic sketches, attempting to replicate the ebbs and flows, the shimmer and the vastness of the ocean. It serves as a classical exploration of the dynamic character of the sea and its relationship with nature. While Monet and Debussy both were influenced by their natural surroundings, 'La Mer' specifically deals with Debussy's fascination and personal interpretation of the sea.