______________________________________________________ 

 what    

NON VISIBLE CITY

URBAN DENSITY

______________________________________________________ 

 how big    

55×33 Km

______________________________________________________ 

 why    

MATERIALIZE THE INVISIBLE

______________________________________________________ 

 where    

ATHENS, GREECE

______________________________________________________ 

 process    

01.100X500m GRID

02.BUILT TO UNBUILT RATIO ON GRID