Make table sets of these "magnifying glasses".Explore colour theory with this simple experiment that involves no mess - bringing the classic childrens storybook Little Blue and Little Yellow by Leo Lionni to life whilst learning at the same time.
Carefully pop off the back of a Sharpie accents highlighter using a knife. Yellow or green works best. Pull out the innards, and cut the plastic. Be careful, it's messy! Put it in half a plastic cup of water. Turn on the blackli