angles building building-construction building-site building-work buildings construction construction-site construction-work danger external height heights high lifts metal-work pipes protected protection railing rails safety scaffolding security steel-scaffolding tall work work-safe workmen crane abstract appearance architectural architecture circular curved dark design edges elements feature geometric geometrical gray grey interconnected lines patterns perspectives points radiating roof roofing rounded secure shade shadows shapes style sunlight surfaces barrier, obstacle, l Chinese, writing, ch climbing, railing, f disallow, forbidden, order, law, instruct safety, danger, proh stroke, ideogram, la symbol, sign, warnin Australia balcony brickwork classrooms doors double-storey double-story education entrance exterior Rooms rural school shelter small stairs steel steps sunshine two-storey two-story veranda verandah water-tanks balance climb climbing construction-sites counter-weights ladder steel-framed straight weight weights cabin cables hoist hoisting lifting light linear modern platforms raising skip anchor bow chinese crew cruise cruise ship cultural culture decks decorated decorative harbor harbour historic levels observers observing ornamental passengers ship spectators symbol symbolic tiers tourism tourist ship tourists viewing decks views war-ship