now, you can see that coin down there, if you look carefully, you can see it  you can't get it, you know where it is, it hasn't gone through a hole into the centre of the earth  it hasn't, sort of, disappeared into outer space, you know exactly where it is, the chances are you could pin point it within a few inches of where i , even if you can't see it  you know where it is, but you can't get at it  to you, it's lost  you know it's geographic location, you know when it went there, you know everything about it, you only thing is you can't get at it!