Kendo (剣道 kendō?), meaning "Way of The Sword", is a modern Japanese martial art of sword-fighting descended from traditional swordsmanship (kenjutsu) which originated with the samurai class of feudal Japan. Swordsmen in Japan established schools of kenjutsu (the ancestor of kendo) which continued for centuries and which form the basis of kendo practice today.
I like the idea of the wood like fence. You could have one panel for every child in your classroom and then use it as a growth chart for toddlers. When the child moves up or leaves the centre you can give it to the parents. Use Pallet wood. by soulouttaki