Looking @ Short Animations for ideas:

I found this animation on youtube done by Korean people. Simple, Smart and very nicely done.



Another simple idea of a short animation done by Pixar in 1997 "Geris Game".
Featuring an old man playing chess on his own but the way it's been directed and animated gives you the illusion that there are two of them.





Here is an other short animation again by Pixar "Knick Knack". Ok this seems a bit more complicated in terms of story coz of the more characters involved but they are simple which makes it easier to tell the what's going on.