A world within a world

I was reading one of my old posts, "I know why the caged bird owner sings," and I was thoroughly confused. Was this an attack on zoos, or a defense?

At the time I wrote the post, I couldn't quite put my finger on why a caged animal, or pet, is so endearing. I think it's because it's like a world within a world. Just like Harry Potter.

That doesn't really explain anything. But I never claimed to do so in the first place.