Having stablished, then, that there is much evidence to show that at both human and sub-human level the ability to see and the ability to hide are both important in calculating a creature’s survival prospects, we must next see whether we can find some means of erecting a system for classifying the components of landscape according to this simple principle, whether or not they are conductive to the observer seeing and hiding. Where he has an unimpeded opportunity to see we can call it prospect. Where he has an opportunity to hide, a refuge. And just as we can identify the desire to see without being seen as something conductive to, but more limited than, the desire to satisfy all our biological needs, so we can recognize its aesthetic basis as the more limited than the aesthetic basis of that more comprehensive ulterior objective. To this more limited aesthetic hypothesis we can apply the name prospect-refuge theory.