cept through effects.' A A J.. Heinz von Foerster, aceLogical Structure of Environment and Its Internal Representation,' in R. E. Eckerstrom (ed.), International Design Conference, Aspen, 1962 (Zeeland, Mich.: Herman Miller, Inc., 1963). aceprogram is nothing . . . don't Pat do that . ..a A A H Lilly, op. cit., p. 104. ficea