Ninja has slowly been declining and having fewer good days. When we're able to take him outside, he seems to really enjoy that. He usually doesn't stops circling incessantly when he's inside. Sometimes the other cats are mean to him even though he can't see where he's going. When he's outside he gets to be by himself (usually with me and the dog) and I think he enjoys feeling the breeze, smelling the fresh air, and listening to the birds. Hopefully we still get a few more sunny days this year for him to enjoy.