Specifications: This model is used for study the image appears in perpendicular mirrors. When we stand at the edge of the mirror and set up by half of the body in front of the mirror, we can see the whole of our body. If we pick up the leg, the image will show us we are flying. The mirror's size is 100 cm in width, and 200 cm in height, 2 pieces. The back of the mirrors fixed with plywood.