" To learn never consists in being made capable of repeating the same gesture, but of providing an adapted response to the situation by different means. Nor is the response acquired with regard to an individual situation. It is rather a question of a new aptitude for resolving a series of problems of the same form. It is known that, in children, the acquisition of differential behavior with respect to colors is slow and difficult. When the child has succeeded in distinguishing red and green and naming them comcretely, what is acquired is not properly speaking the discrimination of these two qualities as such; it is a general power of comparing and distinguishing colors: all pairs of colors benefit from the distinction of red and green and differential behavior progresses not from one to the other but by a finer and finer discrimination with regard to all of them. "

― Maurice Merleau-Ponty , The Structure of Behavior