There are 5 building on the top of the box, but they are too low to be called Skyscrapers, but you can changed the height of those buildings. 

 

  When the height of the buildings are matched with that of being intended, then the lock is going to be released and you can open the drawer. 

  

  I imagine it is like 5 PM in Japan when you can hear a chime telling kids that it is already time to go home and the sun is going down gradually extending the shades till it gets completely dark. 

  it is fun to look at it carefully and make a little story of your own with this box. 

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