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 bay garden grove landmark modern plant super tree vegetation afternoon art Australia beach beautiful blue branches brown calm coast dez pain eucalypt fence graphic green healthy holiday impressionistic leaves nature ocean outdoors pacific painting pandanus paradise peace queensland reflection relaxation ripples sand scenery sea shore summer surreal tropical vacation water wet. foreshore xymonau