I have house guests. They are not unwelcome and they are unassuming, but nevertheless I find myself creeping about the house like one of the cats, hoping not to bump into them in the hallways. I drove around last night and considered going to the local pub, until I called my fellow homeowner and confirmed that the house was empty and they were out for dinner. And I suspect the same is true for them. I keep seeing doors close just as I climb the stairs, we instinctively and politely turn away in the mornings so that I don't have to reveal my unmade-up face and they don't have to disclose the condition of their pajamas. What is it that makes humans so wary of each other? Or perhaps it's just me--I'm especially neurotic? My cats are also wary but they have instinctual excuses.