Have you watched the children play with K'nex? It is so fascinating. One day we see an arrow or a spear (not my favorites) and the next it is a robot or a clock. This inventive toy is the craze in the blue room right now. You can see anywhere from 1 to 8 children building at the same time. They seem to attract both boys and girls. It is great for small motor skills not only putting them together but pulling them apart to put them away. They are using spacial development and I have noticed that they are balancing their work; same pieces and colors being put on each sides. Their structures are also getting larger and more complex. Then they use them in pretend play after they have them built. They are so proud to show off their finished products and describe what the new thing can do. Here are some examples: Erik and his helicopter. Luke and his Robot. Nico and his robot. Ryan and his hat. trent and his clock.