A classroom should be a place where a child can think freely, and not be chastised for any of their ideas. The classroom should be a place where a child can grow and develop, and be supported each step of the way. The classroom should be warm and inviting, and should be a home to each of the children that are a part of it. Many times a classroom belongs to a teacher, in an ideal classroom it would belong to the teacher as well as each student. I believe teaching is an art, not a science.
Science is something that can be proven and tested, and usually works the same way each time.
Art on the other hand is creative, and requires freethinking, much like creating a successful classroom and successful learners. Teaching requires time and flexibility, and the willingness to accept changes. There are no set theorems or rules for dealing with kids. I believe the student determines the direction of personal growth. There is only so much a teacher can do, and even an excellent teacher cannot force a child to experience personal growth.