<p>In writing this book my main purpose is to set forth a way of thinking about art. The most that such a book can do is to direct the thoughts, awaken a sense of power and point to ways of controlling it.<br><br>The principles of art teaching here outlined might be illustrated in other ways and with better examples. I hope the reader will see how each chapter can be developed into many sets of lessons. The progressions can be varied, materials c...