But there are some things you will never know from that picture. However much you magnify and reel in detail, it can't tell you if crime is generally on the increase, or what lime the citizens go to bed. It can't tell you if the mayor is planning to tear down the old quarter, if the police are corrupt, or what strange things have been happening at Number Fifty-One, Angel Wharf. And the fact that you can break down the mosaic into boxes, move it around and reassemble it elsewhere makes no difference. Some things you will only ever learn by going into that city and talking to the inhabitants.