What musical innovation did Claude Debussy use to create a sense of aimless wandering in his compositions?

Claude Debussy employed modal scales and whole-tone scales in his compositions, which contributed to a sense of ambiguity and aimless wandering. By avoiding traditional harmonic progressions and resolutions, he created fluid, dreamlike soundscapes that evoke a feeling of exploration rather than direction. Additionally, his use of non-functional harmonies allowed for a more freeform approach to melody and rhythm, further enhancing this sense of wandering.