circle color colour delusion icon illusion inner needle optical oval pictogram shiny sign symbol wheel churched family holiday love marriage matrimony merry newly-wed wed wedding above-ground aerial-walkway architectural architecture cables connected connections danger dangerous elevated futuristic Gardens-by-the-Bay height high iconic icons landmarks OCBC-Skyway panoramic panoramic-vistas pedestrians reinforced-concrete safety scenic Singapore skyline steel stroll strolling strong Super-trees Supertree-Grove suspended tree-tops trees vertical-gardens views vistas walkway angel of the north England Gateshead gormley North East public art statue sunset uk