We are also exploring the properties of Light and Shadow. The overhead projector is a BIG hit. It's really fun to project things on to a piece of paper and then trace what is there.
The questions that I am asking here is why the LOVE is just a shadow when it is projected on the wall, and the hearts (gel window stickers) show the colour. Please don't explain to your child yet why the colour shows -- we are trying to experiment so THEY can figure out the answer. THANKS!! We also have other things to experiment with (glass baubles, pieces of cellophane, driftwood and lots of plastic shapes)