A monumental undertaking
    
        
    
      
    
      
    
        
          
          CHINA DAILY |
          Updated: 2023-12-23 09:22
          
          
          
          
        


        
      
    
      
    
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   Li presents a computer-generated model of the Great Wall's tower-beacon system in the workshop in Tianjin. ZHAO ZISHUO/LI RAN/SUN FANYUE/XINHUA 
 
     

     

    "These doors hide the secrets of the Great Wall, and also the wisdom of the ancients," Li says.
     

    In the eyes of Zhang Yukun, head of the research team, the Great Wall is not just a "wall".
     

        
    

        
        
      
    
        
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