unique structure at concourse of london king cross

2000 arches architect arup beehive blue built cascades circular claims colorful concourse construction contemporary crisscrossing cross departures design diagonal elegant engineered engineering europe evening expanded extravaganzas funnel glass great grid ground half hall highlight hub improved iron john king light london longest massive mcaslan metres modern network new panels piers purple radius rail railway red renovated reversed roof semi shape single span spectacle spirit station steel structure stylish swoops tall texture transport triangular tube unique up victorian vinci waterfall white