London's cultural quarter at the South Bank could be transformed by a huge glass pavilion, under new plans to continue the revamp of the area.
The site has been overhauled in recent years with thousands of people flocking to new restaurants and a remodelled Royal Festival Hall.
Now further proposals for the Festival Wing - which includes the Queen Elizabeth Hall, Purcell Room and Hayward Gallery - will see the existing buildings refurbished, and the space between them would become a new atrium, created by a glazed roof.
Artist's impression of the changes
And the "floating" glass box itself would form a new venue and rehearsal space.
Unveiling the new plans - which would cost upwards of £100 million - the Southbank Centre said they would create "a world-class cultural centre for the 21st century, providing more art for more people in better spaces".
In addition there would be a new building alongside Waterloo Bridge which would rehouse a poetry library from the Festival Hall - whose refurbishment was finished in 2007 - and new educational and artistic spaces.
Unused areas will be used to create further facilities, including a new gig venue, and there will be new restaurants and additional public spaces.
Culture Minister Ed Vaizey said: "This ambitious regeneration project will be the final step in the triumphant transformation of London's South Bank."
Detailed costings for the plans, which are still developing, have yet to be finalised. But they are expected to be on a par with the £120 million cost of the work to the Festival Hall.