Where's the Ball?

This idea came from here.  I took three different sized cans and a small ball.  I hid the ball under one of the cans and asked Ella to find it.  No problem.  Then, I put the ball under the same can, but changed the cans position.  Again, no problem to find the ball.  We repeated this step again and again she found the ball on the first try.  So I put it under a different can and tried the game again.  This game never tricked Ella.  I was surprised that no matter how much mixing I did, she still picked the right can on the first try everytime!  She did have a lot of fun with this game though.