aluminium architecture block building England english futuristic glass gray Great Britain grey iconic iron landmark London metal modern offices power ribbed ribs silver skyscraper steel tower blue city lifts reflections windows big Canary Wharf enormous height high huge large symmetry tall tower block urban abstract after hours business busy concept construction corporate corporation downtown exterior facade financial floor geometric glimpse industry labour lights office pattern shiny texture toil trade view wall white collar work workplace lloyd's lloyds loyds prestige prestigious register pipes reflection Gherkin skyline diamonds triangles brown curved walkie-talkie cheesegrater cranes