For the theme The Fearsome Sharks in my school. I narrow down to introduce my kids 3 species of sharks to teach. What i did was, i cut out on pieces of paper the pictures of sharks as well as I got the over head projector ready.I switch off all the lights in my classroom and place the cut out piece of sharks on the overhead projector. When i switch it on, the projector cast a silloute shadow of a huge shark on the wall.My kids love it so much they could't get enough of it. I asked them to head count how long was the shark and most of them were trying to fit in the shadow of the sharks stomach.It's really fun!