The Victoria and Albert Museum in London is one of the world’s most famous museum of art, design and applied art. The Medieval and Renaissance hall have been re-arranged and expanded. The scheme, acclaimed by the V&A as "the biggest project the museum has undertaken since the British Galleries opened in 2001", has been designed by MUMA (McInnes Usher McKnight Architects). The most striking detail of the plan is the roof entirely made of glass. An existing lightwell at the heart of the Medieval & Renaissance galleries has become a daylit gallery covered with a technically innovative double curved glazed roof. Cold twisted insulated glass panels are mounted on a structure system of long glass fins with a varying span up to 11 m. in length in one piece and a varying girder height.