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
Natural materials for light table using clear contact paper and masking tape : For outdoor activity, we collect natural materials with children. For indoor activity, using light table, children can observe natural materials.