aluminium architecture braille building concave concavities convex culture discs elements iconic landmark metal modern New norway norwegian opera house oslo panel pattern silver style surface texture wall 12th Century ancient christian church dark decorative historical Hopperstad mediaeval medieval old ornamental ornate pillars religion religious stave tar tarred tiles Vik wooden turret carved dragon spire tourism tourist attraction weathercock gables sea dragon seadrake building work construction construction helmet high metal work pipes railing rails sacfety line safety safety harness safety helmet safety mesh scaffolding steel scaffolding tall welder welders welding workmen carving city flagstones leisure pavement pedestrians people sidewalk sightseers slope steps stroll tourists uneven walk