Whispering gallery to the walls, an effect that was discovered in the whispering gallery of St Paul's Cathedral in London. The extent to which the sound travels at St Paul's can also be judged by clapping in the gallery, which produces four echoes. Other historical examples are the Gol Gumbaz mausoleum in Bijapur and the Echo Wall of the Temple of Heaven in Beijing. A hemispherical enclosure will also guide whispering gallery waves. The waves carry the words so that others will be able to hear them from the opposite side of the gallery. The gallery may also be in the form
South London Gallery Gallery added to its permanent collection in 1953, to celebrate the coronation, with works by contemporary artists such as John Piper and Christopher Wood, and the next decade acquired over 500 twentieth-century prints. The new London Borough of Southwark took over responsibility for the Gallery in 1965 but under independent trustees. The appointment of David Thorp as Director in 1992 brought what then came to be known as the South London Gallery into its present phase, when it espoused Britart and staged significant "cutting edge" exhibitions. The Gallery was the first venue for the showing of Tracey Emin's "tent", "Everyone