Extension to Whitechapel Art Gallery, London: the main staircase from the ground floor to the new first-floor galleries via the mezzanine level

The Whitechapel Gallery in London's East End was designed by the architect Charles Harrison Townsend. This extension and remodelling of the interior by the architects Colquhoun & Miller was the first major alteration to the building since its completion in 1901. See RIBA130103 for a colour version of this image.