Traffic on the road linking the two squares, Whitehall, will also be restricted to a single lane.

ECONOMIST: Battle of Trafalgar

The two buzzing squares make Piata Libertati feel like an oasis of relative calm, its trees offering shade to anyone who cares to sit and watch life sweep past.

BBC: An ancient Ottoman capital surfaces

It's been two years since John Mayer released his breakthrough album, Room for Squares, and those two years have been good to him.

NPR: John Mayer, Live in Studio 4A

First presented on 11 March, 2002, and shown annually on 11 September ever since, the tribute consists of 88 7, 000-watt xenon light bulbs placed on a roof near the WTC site in two 48-foot squares that echo the shape and orientation of the twin towers.

BBC: 11 September history tour of New York

The end result was an array of 1, 024 squares, each two-thirds of a millimetre wide and made of up to 15 chemical layers, each just one five-millionth of a millimetre thick.

ECONOMIST: Combinatorial chemistry