This is a great demonstration product to be used to show your kids how topographic maps depict a three-dimensional surface onto a two dimensional surface.
Minor complaints would be the circular design that's molded into the top cover that really gets in the way of tracing on the acetate. Also, the thickness of the plastic could be a little thicker. The cover gets flexed a little bit when putting the weight of the drawing hand on top of it and we already have a small stress crack on it.
Finally, an erasable market works much better than the supplied crayon that barely marks the acetate.
Transform a 3-dimensional mountain replica into a 2-dimensional topographic map as you teach your children how contours represent different levels of elevations. Includes detailed project instructions.