Each text focuses on one or several of Stockhausen's main artistic concerns, such as extending the listener's perceptions of time and pitch, reconciling opposing tendencies, or shifting awareness from one perceptual area to another. Specific earlier works may be reflected in certain of the texts. "Intensität", for example, suggests a passage from "Kontakte", and "Unbegrenzt" recalls large parts of "Carré". The influence of performing "Prozession" and "Kurzwellen" can be heard in the recordings made by Stockhausen's own ensemble. In addition, pianist Aloys Kontarsky frequently alludes to Stockhausen's "Klavierstücke" (especially "Klavierstück IX" in "Abwärts") and Harald Bojé sometimes evokes "Kontakte" with his electronium.