“…art training is not one of the minor fillers of the curriculum, but relates to the very fundamentals of education. What are these fundamentals? Reading, writing, and arithmetic? Certainly these are indispensable skills; but should we not realize by now that they are just skills? And that even as a list of skills the list is incomplete? If I am not mistaken, the three fundamentals of education are
Perceiving
Thinking
Forming
And the tools needed to exert these faculties of the mind are numbers, words, and shapes. Of these three sets of tools the first two have been considered the only essential ones since the Middle Ages. We must now rehabilitate the third.”

Rudolph Arnheim, “Perceiving, Thinking, Forming,” Art Education Magazine, March 1983