Is There a Gap Between Us?

I am no longer invisible because it says at the start of your next turn. Can you give me a definition of kind of close a little bit more? Yeah, I say actually they're probably within five feet of you. How far are they from how high up are they? Because they're flying. Let's say they're they're close to the ceiling. The ceilings are about 20 feet high. So they're on a horizontal access close to me, but in reality there's a gap between us.