Shadows and Silhouettes

I have been playing with a new concept for the Year 6 classes. I was thinking about silhouettes and shadows. What one sees when blinded by the sun and all that you get it a black shadow. You need to put enough detail into the shapes to explain what one sees without the lines. No pencils or lines allowed, which is quite a challenge. I think that with the tissue paper it gives a great contrast not only because of the basic colour but also because you can achieve different gradations of colour , which gives an added dimension. Pure shapes and pure dreams.....