Fun Play Rainbow Pebbles impressed testers from the very first day they appeared in our testing centers. It is just so well made on every level. The card stock for the suggested patterns is thick and durable. The pebbles are smooth and appealing with their vibrant colors (that actually feel like real pebbles). Each pebble also varies in shape, which is great for tactile recognition and fine motor play. The inclusion of the black tray to keep the pebbles contained caught the attention and approval of parents. The pebbles are fun and entertaining but also quite educational. The set comes with instructions to not just recreate the pictures on the cards but ways to enhance sensory and creative play. This set brings with it an extra advantage in that it is suitable for solo play, competitive play, or cooperative play, depending on your child. One favorite activity was seeing how many pebbles could be stacked on top of each other. Because the pebbles vary in shape, size, and thickness, stacking them helps teach your child how to balance and observe the size and weight of each pebble and the effect one pebble has on the rest of the tower. This ended up being an extra learning experience that was an unexpected, welcome surprise.