Originally Posted by Portia
Since it's summer, go to local Home Depot type store and get pvc pipe with joints. Let him build something and watch water flow through it.

That is a terrific idea, Portia. I'm going to steal it for DS19mo who becomes easily frustrated with the disconnect between his thoughts and manual dexterity.

ETA: I'm not keen on the toxicity of PVC, but did find a PVC-inspired pipe toy online made of polypropylene. (http://www.konstruktubes.com/about.htm)

What is to give light must endure burning.