Boards games and constructors
This is a very hard puzzle. It consists of three layers. Each layer consist of transparent puzzle items, through which you can see underlying layers. Every layer contains impossible construction and men, which are going on it. You can combine three layers in various combinations to create different images. Visiblity of underlying layers gives 3D effect to the final image.
Below, there are photos of puzzle box, three superimposed layers, and images of all three layers.