Twins Fighting over Plastic Pitchers

Twins, and I am sure most babies, love anything that is not defined as a real 'toy'.
Thank being said, my twins love this plastic pitcher I use to add water to my water fountain hanging on my patio wall.

They fight over it. They run around the house or patio hitting each other and fighting over it.

Goodness, so, get another plastic pitcher I have and give it to the twin who is fighting over her sister's pitcher.

Guess what, she still wants the pitcher her sister has. What is up with this? I do not understand why one baby can not be satisfied with something I give her that is almost like the pitcher her sister has.

Fighting over the same toy or plastic pitcher just does not make sense to me. I am finding that redirection works best as a distraction.