Specifications: This Marvelous Mask is used for the study of the creation of light and shadow of an object. This set consists of one convex mask and one concave mask, which are all 3D. When we walk pass the concave mask, we will see it in a convex form and it will look as if the mask always look at us. The structure is a rectangular box of dimensions 80x40x20 cm. There are 2 rectangular slots for the masks of size 36x30 cm. There will be a light attached to the side of the box, the mask are made of wood covered with Formica plastic.