14. The Pedagogical Basis of the Waldorf School
Visual aids are undoubtedly justified within certain limits; but when a materialistic conviction leads people to try to extend this form of teaching to every conceivable thing, they forget there are other powers in the human being which must be developed, and which cannot be addressed through the medium of visual observation. For instance, there is the acquisition of certain things purely through memory that is connected to the developmental forces at work between the sixth or seventh and the fourteenth year of life. It is this property of human nature upon which the teaching of arithmetic should be based. Indeed, arithmetic can be used to cultivate the faculty of memory. If one dis-regards this fact, one may perhaps be tempted (especially when teaching arithmetic) to commit the educational blunder of teaching with visual aids what should be taught as a memory exercise.