Cemento Armado This sculpture is rooted in the urban esthetics of tunnels and subway stations. Created in collaboration with the Swedish graffiti artist Pablo Madera. On one early morning in 2003 Cemento Armado were placed in front of the City Hall of Oslo. It remained in these grand surroundings for a month before disappearing, probably to a garbage dump. Many people thought Cemento Armado made a positive statement among the nationalistic art at the City Hall area.