"Every observer has noted that the younger the child, the less sense he has of his own ego. From the intellectual point of view, he does not distingu… - Jean Piaget

Thus, even in those fields in which logic does not normally play a part, there exist outline structures which are the precursors of logical structures, and which can be formulated in terms of the algebra of logic. From a comparative point of view, these outline structures are of great interest. It is not inconceivable that a general theory of structures will at some future date be worked out, which will permit the comparative analysis of structures characterizing the different levels of development. This will relate the lower level outline structures to the logical structures characteristic of the higher stages of development. The use of the logical calculus in the description of neural networks on the one hand, and in cybernetic models on the other, shows that such a programme is not out of the question.

Nel, after throwing a stone onto a sloping bank watching the stone rolling said, 'Look at the stone. It's afraid of the grass

to avoid the difficulties of teleological language, adaptation must be described as an equilibrium between the action of the organism on the environment and vice versa.