The children at Caillou's day care are curious about the new recycling bin-it has four openings, what are they for? Ms. Martin has an activity planned to demonstrate recycling plastic, glass, metal, and paper. She has some very impressive examples of recycled things to show the children, even a T-shirt made of recycled bottles for the recycling monitor. The book inspires interest in recycling while explaining its importance in a simple and fun way.