In the early sections of Chapter 7 we considered the elementary behavioural facts of the kitten adapting, and related them to a mechanistic theoretical construction, the ‘ultrastable’ system. In the present chapter we will consider some further elementary relations between the real organism and the theoretical construct. We will consider, in particular, what can be said about the simple theoretical system shown in Figure 7/5/1. How does it correspond to the real organism and the real environment? We must go with caution, for experience has shown that a jump to conclusions that are grossly in error is only too easy.