Marble and Water ChannelsThe marble and water run is a playful method for children to learn some simple scientific facts about gravity effecting running water or rolling marbles. The channels can be used outside in the sandpit or on the grass for use with water and indoors if playing with marbles. A few small accessories provide further scientific insight such as a small plug stops the marbles, a hole in the channel as the water or marble disappearing before the child's eyes.