Waldorf Science Kit #9 Optics- Light Pipe, Grades 6 - 12This Waldorf Science Kit was developed to assist teaching grades 6 12 science blocks in the Waldorf Curriculum. This kit contains a 24" bent lucite rod used to show how light follows a bent path by multiple internal reflections. Sold as a single item. This Waldorf Science Kit can be used hand and hand with the following resources that include descriptions of the physics blocks: Physics for Waldorf Middle Schools: Grades Six, Seven, and Eight A