I have many different materials that I use and rotate. I have been incorporating more natural items, such as larger rocks, pine cones, shells and leaves for the kids to study. After reviewing many of these modules, I can tell that I have way too many items and will need to put many of them away. It is not cluttered, but it needs to go down in size. Instead of having 50 play animals, I’ll need to get rid of doubles, and condense it down so that it is kept simpler. Less is more.