In pictures: inside Tate Modern's £260m expansion

The view from Herzog & de Meurons new extension at Tate Modern
Herzog & de Meurons new extension at Tate ModernA staircase in the new extensionA video by Marvin Gaye Chetwynd on show in the oil tanks downstairs 
Visitors admiring Mary Martins, Inversions, 1966 
Children playing in galleries on preview day 
Kader Attias city made out of couscous, Untitled (Ghardaa), 2009 
The honeycomb wall in Herzog & de Meurons new extension 
A bed capsule by Ricardo Basbaum