Wood
Kraul Spielzeug
Kraul is a German family business that encourages a love of nature, observation, and experimentation. Using the basic elements around us (earth, fire, wind, and water), Kraul's STEAM and engineering science kids allow kids to wonder at the world and inspire hours of nature based play.
The boat that goes against the current
The paddle wheels are driven by the water current. At first the boat floats away with the current, unwinding the line. But as soon as the line is unwound, it paddles happily on, only it returns against the current.