Earlier tonight I was thinking it's like I know others are a person like tuning in on a radio. I know the other radios are radios because I can tune into them. But you can't tune into ones own radio

But then I thought, "well only a radio can tune in to the radio"

But someone can see and recognize a radio without being a radio, so back to the starting line but it was an interesting thing to think about, regarding "I can tell everyone else is a person, but I don't know if I am.”