I was just wondering, how far do you think you have to be from a person before it becomes difficult to determine who they are? Like, if you're a certain distance away, maybe twenty or twenty-five feet, do you think you could say without a doubt that a person is definitely so-and-so (whoever...)? If twenty-five feet isn't far enough to not be able to have some doubt about recognising a person, how far do you think would be far enough?
I realise that this is a bit of a weird question, but any help would be much appreciated. Thanks!
~Anna.
