Reciprocity Whenever human activities incorporate machines or rigidly prescribed procedures, the modes of human interaction change. In general, technical arrangements reduce or eliminate reciprocity. Reciprocity is some manner of interactive give and take, a genuine communication among interacting parties. Ursula M. Franklin, The Real World of Technology reciprocity
Architectural dark matter Every building had its rhythms. These service corridors were the internal hinterlands—the architectural dark matter—so beloved by Bill Mason. Geoff Manaugh, A Burglar's Guide to the City Sonorisms I euphonyinfrastructure