The Optical Illusion Pack Author:Janet Sacks Not only is this incredible kit packed with more than 100 mind-boggling illusions, it also explains the science behind them. Kids will love learning how the brain tricks the eye into seeing what mayor may notactually be there. Sections explore: Impossible shapes that appear real but are not Static objects that seem to move Camouflage... more » techniques used by animals The magic behind animation 3D images, and moreThis fun and unusual pack comes complete with lots of cool accessories to help with the illusions including: 3D glasses, a thaumatrope (for animated illusions), a press-out impossible triangle, plus acetate sheets and spinners for creating vibrating lines and other illusions. A built-in storage pocket secures illusion accessories.« less