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
Faras Gallery at the National Museum in Warsaw the 7th until the 14th century. The Cathedral was built on the foundations of an older church, built in the beginning of the 7th century AD. In rooms II and III the visitors can view films on the history of discoveries, Nubia and the Nubian Campaign, as well as individual paintings, their style and iconography. Also shown are the photographs of the archaeological campaigns and the photographs of artworks which were transferred to the National Museum of Sudan. Another presentation concerns professor Kazimierz Michałowski, the archaeologist who discovered the Faras Cathedral, and the patron of the gallery. This room contains