in historic engravings of the city, and believed that its presence would be far more delicate than opponents of the project alleged. He proposed a sophisticated use of glazing, with expressive façades of angled glass panes intended to reflect sunlight and the sky above, so that the appearance of the building will change according to the weather and seasons. The building features 11,000 panes of glass, with a total surface area of equivalent to the area of almost eight Wembley football pitches. The Shard was designed with energy efficiency in mind. It is fitted with a combined heat and power (CHP) plant, operating on natural gas from the National Grid. Fuel is efficiently converted to electricity, and heat is recovered from the engine to provide hot water for the building. Following the destruction of New York's World Trade Center (WTC) in the terror attacks of 11 September 2001, architects and structural engineers worldwide began re-evaluating the design of tall structures. The Shard's early conceptual designs were among the first in the UK to be amended following the publication of the US National Institute of Standards and Technology (NIST) report into the collapse of the WTC. The building is designed to maintain its stability under very onerous conditions, with its post-tensioned concrete and composite floors, load-bearing pillars, and tapering shape giving it a sway tolerance of . In 2014, The Shard claimed first place at the Emporis Skyscraper Awards, recognising buildings over completed in the previous twelve months. The Emporis judges hailed the building as "a skyscraper that is recognized immediately and which is already considered London's new emblem". Layout Sources: The-Shard.com and The-Shard.com and Billionpoints.de. Construction For the construction of the skyscraper some path-breaking engineering methods were used, such as top-down construction, where foundations are dug while the core is built up – this was a first for the UK. In February 2009, a mobile crane and a small piling rig arrived on site. In early March 2009, the crane began putting steel beams into the ground, as part of preparations for the core of the building. Full construction began on 16 March 2009. Demolition work on New London Bridge House started in May 2009, as part of the concurrent London Bridge Place project. The first steelwork went into The Shard's piles on 28 April. Five cranes were used to build The Shard, with four of them 'jumping' with the