Much research in environmental studies has been devoted towards finding the one meaning which the environment has, either for an individual or a group. Like the hunt for a Platonic idea of a 'table' by the analysis of constructed tables, this assumes an ideal, unchanging world; an assump-tion which re-appears in theories of functionalism or 'ideal fit'. The search for meaning at a different level must involve, not only a re-exami-nation of theories of meaning in architecture, but also the discovery of a generative structure. Bernstein's 'Theory of Codes' hopefully provides a starting point for this investigation by studying how potential meanings are actualised in various modes by classification codes operating in a variety of contexts.