Wanting other children's ball

Sometimes Marian wants to take a ball to the playground. But if there is another children's ball there, she would rather play with that. I think this is just because there is more to learn from a ball that she is not familiar with.

I may try taking a ball that she is not familiar with and see if she still goes for another ball. She could still go for another ball because she may think that she will not have the opportunity to play with it as much as her new ball.