The fourth piece, ＜Indigo Valley＞, is in 2/4 time and marked "Vivo (flowing)" at the beginning. It begins ff, and if the previous piece focused a spotlight on a part of nature, this one gives the impression of the view suddenly expanding. However, it diminuendos in the second measure, and the main theme, presented from the third measure, is marked p. Throughout the piece, the figure from the opening two measures serves as accompaniment, above which a melody marked "ben marcata la melodia" is placed. The dynamic range employed is wide, spanning from ppp to fff.