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 Tuesday to Sunday, 11am–6pm, Wednesdays and the last Friday of every month until 9pm, exhibitions are free. South London Gallery The South London Gallery, founded 1891, is a public-funded gallery of contemporary art in Camberwell, London. Until 1992, it was known as the South London Art Gallery, and nowadays the acronym SLG is often used. Margot Heller became its director in 2001. The gallery traces its origins back to the South London Working Men's College at 91 Blackfriars Road in 1868, whose Principal was the biologist Thomas Henry Huxley, the grandfather of Aldous Huxley; the Manager was William Rossiter. In