TWINVILLE-NATURAL WOODEN STACKERRainbow stackers are not just there to look cute as shelf dcor in the nursery but as your child grows older it can help with development. Some of the benefits and important areas of development that children exercise are hand eye coordination, fine motor skills, practicing problem solving, pattern recognition and logical reasoning to name a few. How do you play with them? Stack them by size into a rainbow (remember it is a puzzle so they only fit