Well then. I'm assuming you're referring to the E major arabesque rather than the G major arabesque, which I'd be more inclined to describe as "fun" than "beautiful". Still, in my mind it's hardly the most arresting piece from Debussy's quill (or whatever composers used to write in the Impressionist era - paintbrushes?).... so if it's discussion of Debussy you're so intent on seeing, my own nominees would be such pieces as the Ballade, Reverie, 'Reflets dans l'eau' and 'Hommage a Rameau' from Images I, 'Et la lune descend sur la temple qui fut' from Images II, the omnipresent 'Clair de lune' from the Suite bergamasque, perhaps 'Jimbo's Lullaby' and 'The Snow is Dancing' from 'Children's Corner'.... I've never really managed to get into the Preludes so I have no nominees from those, but there are other people on these boards who do, I'm sure. And although they're not for piano solo, I'd also add certain movements of the sonatas for violin and piano, cello and piano, and flute, viola, and harp. All of those are pieces I enjoy playing or hearing when in reflective mood - a lot of Debussy is very good for that.