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quite a few windows have a red triangle in them, f.e. http://360gigapixels.com/tokyo-tower-panorama-photo/?v=-154.2,18.4,1 http://360gigapixels.com/tokyo-tower-

• harisenbon 13y ago
  Emergency entrances for fire / rescue. You are not allowed to put anything in front of those windows, so that firefighers know they can break those windows to easily gain access to a building. They can then be used to help people escape, or get more firefighers into the building.
  • alternize 13y ago
    i see, makes sense. thanks!