Is "Aquarium" an animal? Of course not. As explained at the beginning, this is a carnival procession, and since fish cannot walk, aquariums are placed on floats. The sight of fish gracefully swimming in an aquarium tunnel, viewed from below, is truly fantastical, and the piece depicts this scene and its impression. In terms of orchestration, what first captures attention is undoubtedly the sound of the glass harmonica (an instrument with the same sound production principle as the glass harp), which dominates the piece's tone. However, one must not overlook the subtly introduced low-to-mid range of the flute, which anticipates the use of the flute frequently employed in Impressionism and other styles after Debussy's Prélude à l'après-midi d'un faune.