angles architecture black-and-white building buildings cambodia concrete construction construction-work dangers daylight distance distant frame framework galvanised galvanized gray grey greyscale metal metalic monochrome multi-storey multi-story people ribbed ribbing risks risky roof roof-trusses roofing safety sheeting sheets shelter sheltered steel structural-work structure trusses upper-storey upper-story workmen appearances architectural Australian balconies balcony contrast craftsmanship dark Designs detailed distinctive elements exterior external Haze hazy heritage historic historical light old perspectives protection protective quality railing rails smoke stairs steps structures style supports three-storey three-story upper-floor veranda verandah windows brickwork intricate lower-floor ornamental stonework two-storey two-story