Explain the world to a child, the distances that are covered by plane, boat or train, different continents, it’s fun. In my case it is also useful because the family is across the ocean. Explain these things with a globe is easier, see the places, we see that among the Italian family and there is a lot of water that somehow you have to cross. So, with great potential for a world map and I think that would be even better if I could scribble on it. The world as a small slate devoted to the virtual tour.
I found this tutorial that explains how to turn a globe (if used better, costs less and you will not mind paint it all!) on a blackboard. It serves the blackboard paint, preferably two or three colors, so as to differentiate the sea from the continents. It begins by painting the sea, changing blackboard paint to draw the continents and finishes brushing boundaries. Find the blackboard paint is easy, look at this post on how to mess up the walls without problems.