Today when we took our 2 year olds up to the large activity room, we noticed an overhead projector. I realized I had not introduced them to this yet! I turned off the room lights and directed the projector to the screen. This room happens to have a stage in front of the screen - perfect for small children! They were more interested in being up near the screen rather than at the projector itself. I've found that by 3 and 4, they are more interested in the projector, understanding that it is what's producing the light. What a fun way to introduce light and shadows!