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
Willis Building (London) Tower. Willis Building (London) The Willis Building is a commercial skyscraper in London named after the primary tenant, Willis Group. It is located on Lime Street in the City of London financial district. The building was designed by Norman Foster and developed by British Land. It stands opposite the Lloyd's building and is tall, with 26 storeys. It features a "stepped" design, which was intended to resemble the shell of a crustacean, with setbacks rising at and . In total, there are of office floor-space, most of which was pre-let to the insurance broker Willis. The Willis Building was constructed