above-ground architectural architecture danger dangerous elevated futuristic Gardens-by-the-Bay height high iconic icons landmarks panoramic panoramic-vistas reinforced-concrete safety scenic Singapore skyline steel strong Super-trees Supertree-Grove suspended tree-tops trees vertical-gardens views vistas angles aerial-walkway cables connected connections OCBC-Skyway pedestrians stroll strolling walkway all-weather-space bark branched branches caudex conservatory deciduous display displayed distinctive dome dormant dorstenia-gigas exotics flower-dome gardens glasshouse gnarled greenhouse grotesque horticultural horticulture indoors moraceae ornamental pachycaul-shrub plants shape shaped shapes Socotran-fig-tree succulent surface surfaces texture textures tree trunk unusual utilitarian vegetation Apocynaceae caudiciform-plant fat-twisted-roots fockea-edulis ground-level Hottentot-bread semi-deciduous South-Africa-native vine-branches bottle-shaped bottle-tree ceiba-chodatii floss-silk-tree inside palo-borracho South-American stored-water subtropical swollen-trunk tropical warty-tree atrium atrium-casino cantilevered-platform capacity casino complex convention-center convention-centre exhibition-center exhibition-centre high-rise highrise hotel huge landmark large mall modern museum palm-trees palms platform public public-cantilevered-platform resort Restaurants shops Skypark skyscraper theatres towers angled botanical-gardens clouds columnless-glasshouse conservatories conservatory-complex construction controlled- temperature curved curves curving domes energy-efficient foliage garden glass heating high-tech hothouse indoor-gardens light lighting optimized-conditions overcast shrubbery shrubs structure sustainable-building-technologies transparent ventilation visibility warm-growing-environment windows atmospheric-humidity cloud-forest cooling regulated-climatic-conditions