This revolutionary addition to Mobilo’s high quality building sets unlocks children’s natural desire to experiment. It develops their concentration and provides a fun and exciting way to discover the principles of the physical world for themselves. Which direction do the wheels turn? Why do they go fast or slow? How does the sand flow? What happens when the flow is adjusted on the funnel? Or, what happens when the wheel is in another position? The mobilo flow set for experimentation, investigation, amazement and fascination. Includes 2 funnels, 4 paddle wheels and 128 Mobilo pieces stored in a mesh bag.