The best summary that is objective and complete is:
"The story is a fable about a cat who tries to show its animal friends a picture. The friends all make the mistake of standing between a mirror and the picture, so they only see themselves—not the picture. Because they all see something different, they each mistakenly think the others are lying. In the end, they are all angry with each other and the cat is the only one who understands what happened. The cat summarizes the story’s moral, which is that one will see what one expects to see in a text if they are not careful to look past their own ideas."
This summary accurately covers the main events of the story while also including the moral, making it both objective and complete.