Struktur, die reine ~ / Structure, Pure ~

From the canonical works, No. 1

A paper strip, resembling the loop of a Moebius strip, feeds through the movement of a musicbox. If a theme were punched in and the movement’s crank turned, that theme would surely become audible, could then be inverted and later restated. But no theme gets punched and the crank stays still. All structure, untainted by actual sound.