Example 14. Section A of Éclat. Background structural tone Bflat4 is a common tone that appears within each figure and is given emphasis in the sketches and musical setting (sketch material from Mappe G, Dossier 4b,6 (582–564) and Mappe G, Dossier 4a, 1 (582–516)). Pierre Boulez Collection. Paul Sacher Foundation.