1. A teaching method for teaching complex and/or abstract concepts by means of both a conventional textbook and complementary animated moving illustrations which provide an animated textbook, said teaching method employing a conventional textbook and a complementary electronic display and comprising, (a) opening the conventional textbook to a page or pages which describe a selected complex and/or abstract concept so that the student can read and study the text book description of the selected concept, (b) storing animation data for the selected concept on the electronic display, (c) operating, by input from the student, the electronic display for displaying the animation data to the student in the form of animated moving illustrations which are complementary to the selected concept described in the conventional textbook and to thereby display the animation data in the form of an animated textbook. said electronic display being constructed so that the electronic display can be operated in both an initial teaching mode for displaying the animation data in an initial, predetermined sequence and in subsequent drill mode which requires continued participation of the student in order to continue the display and in order to obtain displays of animated illustrations responsive to specific inputs from the student, whereby the selected complex and/or abstract concept can be taught by the study of both the conventional textbook and the complementary animated moving illustrations which provide the animated textbook.