I have a set of round wooden Russian dolls on my desk. There used to be ten of them, one goes in another, etc. I should have left them all together. I can't complain though, I still have six of them left. His new favorite fun thing to do is to take one of the smaller ones all the way to the top of the wooden stairs and drop it. Should it happen to not make it all the way down, he gives the extra nudge necessary. At the bottom of the stairs is my desk and bookcases. I have not looked yet but strongly suspect there are four Russian dolls under there somewhere. It must be a lot of fun to hear a round wooden doll plunk, plunk, plunk down the wooden stairs; fun to a cat, that is.