The Tate Modern has this morning revealed these extraordinary images of Herzog and De Meuron's new extension to its famous Bankside building.
The new space - which its backers describe as 'iconic' - is supposed to symbolise the success of 'creative Britain'.
The building will be located to the south side of the gallery on a site close to a number of plots that have previously caused much local controversy.
The project has however won the backing of Ken Livingstone, who announced that he would pump £7 million into it through the London Development Agency.
The development will create approximately 23,000m 2
of new space, with the overall size increasing by 60 per cent.
One of the main ambitions of the scheme - which apparently 'completes' the entire Tate Modern project - is to open a south entrance, a move that will connect the gallery with its southern neighbours.
This will also allow for a new 'north-south street' running through the building, which will be open for at least 12 hours a day.
The new building will not just be made up of gallery space; it will also include education and performance facilities.
The Tate, and its director Nick Serota, hope to win planning in the first half of next year and fast-track the construction so it is ready in time for the 2012 Olympics. by Ed Dorrell