Figure 25. Four isographic K-nets (g1′, g2′, g3, g4) combine to form a “hyper-network” or “middleground” K-net structure
a) Schoenberg, op. 11, no. 2, four chords excerpted from Lewin's Ex. 9
b) Four network interpretations excerpted from Lewin's Ex. 10
c) Lewin's Ex. 12: interpretations g1 and g2 and their negatively isographic permutations g1' and g2'
d) Network that (recursively) interprets g1', g2', g3, g4, based upon Lewin's Ex. 13