angles balance building building-construction building-work climb climbing construction construction-sites construction-work counter-weights crane danger height heights high ladder metal-work perspectives pipes railing rails safety security steel steel-framed straight tall weight weights work work-safe workmen cranes angled appearances architectural architecture buildings city city-scapes city-views color colour contemporary contrast contrasting distinctive edged edges elements exterior external framed frames geometric geometric-shapes glass gray grey high-rise light linear lines modern patterned patterns sharp Singapore surface surfaces textured textures views wall walls windows architectural-elements business commerce concrete curved curves monochrome palm-trees skyscrapers trees