Whomever did this I am sure has a touch of obsessive-compulsive disorder, to say nothing of an unhealthy attachment to her cat.
Can you imagine spending all that time building such a thing only to let your cat play in it???
Don't get me wrong, it is a real work, and I respect the tenacity and skill required to construct such a thing. I just can't imagine why a person with that much time and skill woudl use it for this purpose.
But then I don't "get" modern art either.