ABSTRACT
Imagine that you are at the beach and there is a little beachball, smaller than a volleyball, at your feet . Someone calls out, 'Kick it!' Imagine now kicking it really hard. Good! Now suppose the ball is at your feet again and someo ne calls out, 'Pick it up and throw it to me!' Imagine now throwing that hall. Good! Now, one last th ing. You are sitting in th e doctor's office facing th e door into th e doctor's room. You hear some people talking in the room but you can' t make out what they are saying. So you strai n to hear. You turn your head slightly towards the door . ow, you can make out what is being said!
