He nodded to an invisible person or persons outside plate range.

Then you've got the monologues to God, which is like playing a scene with an invisible person.

Any invisible person would have to leave footprints behind him in this white snow.

"I'm sorry to bother you," I said to the person invisible behind the door.

For it is the invisible person who tells the visible world's stories.

She seemed to be choking an invisible person on the floor in front of her.

That invisible person who is supposed to be there when you call, the last hope of help and true love.

Even the young officers ignored him; he was just that kind of invisible person.

"It's a conversation with an invisible person who is not in the room."

I too though about that concept and felt the weird feeling of some invisible person is watching me.