Despite "its apparent" abundance - even if there is more water on the earth's surface than there is land - it should not be wasted. Teaching our children to value, respect, and, above all, not waste water, is an important - and ecologically sound - lesson that should be taught from an early age! This is one of the goals of this installation at the Kindermuseum theme H20 or in lay man's term, water.
My daughter's class went there, with me and other moms chaperone. :)
In this photo you'd see my daughter (in pink) reaching onto something. That would be her popsicle sticks-boat. The kids were allowed to play with them on this water installation---furnitures put up to create a continuous flow of water and ends up on a literal water bed... The water then returns to it's source afterwards.
More photos here.