“…In addition to leading to conclusions about invariantlength structures, another main, and connected, generalization we may make is that, because of the invariant-length structures, behavioral selected networks become increasingly differentiated as they enlarge. Others have studied the increase of differentiation in behavioral networks such as organisms [18 -29], social insects [1, 30 -32], businesses [1,[33][34][35][36][37][38][39][40][41], computer software [42][43][44][45][46][47][48], electronic circuits [1], as well on hierarchy more generally [49 -52]. We see here in Figure 4 that increasing differentiation in larger networks appears to be common (possibly universal?)…”