airport control control tower former standby tower tower views unused visibilty buildings canada height sea tall toronto tower CN tower views air traffic control airline airplane architecture atc aviation berlin command flight fly holidays plane radar tower signal tracking traffic air-traffic-control aircraft architectural communications control-tower directions directives flying high safety tower-signals tower-views building business complex coporate corporate success highrise modern multi-storey multi-story Singapore skyscraper towering azure bank bay beach blue clouds coastal-landforms communication-tower conifers dark distance distant dunes dusk footprints headland homes houses late-afternoon natural-landscape ocean ocean-views pine-trees prime-real-estate sand sandy sky surf tracks trees vegetation vehicles water waves angles business-district city city-scapes city-views color colored colors colour coloured colours commercial-building contemporary contrast contrasting elements exterior external glass heights high-rise light linear lines metropolis metropolitan-area office-buildings perspectives rectangles rectangular reflections skyscrapers tower-block urban-area walls wealth windows abstract accommodation business complexes comparison corporate curved office office complex office highrise offices