When children reach high school age, the pupil-teacher relationship changes specialist teachers replace the class teacher. Physics, for example, is introduced in the sixth grade and continued each year as a main lesson block until graduation. As the students mature, they engage themselves at new levels of experience with each subject. It is as though each year they come to a window on the ascending spiral that looks out into the world through the lens of a particular subject. Through the main-lesson spiral curriculum, teachers lay the ground for a gradual vertical integration that deepens and widens each subject experience and, at the same time, keeps it moving with the other aspects of knowledge.
All students participate in all basic subjects regardless of their special aptitudes.
The purpose of studying a subject is not to make a student into a professional mathematician, historian, or biologist, but to awaken and educate capacities that every human being needs. Naturally, one student is more gifted in math and another in science or history, but the mathematician needs the humanities, and the historian needs math and science. The choice of a vocation is left to the free decision of the adult, but one's early education should give one a palette of experience from which to choose the particular colors that one's interests, capacities, and life circumstances allow. The arts and practical skills play an essential part in the educational process throughout the grades. They are not considered luxuries, but fundamental to human growth and development.