Whispering-gallery wave Whispering-gallery wave Whispering-gallery waves, or whispering-gallery modes, are a type of wave that can travel around a concave surface. Originally discovered for sound waves in the whispering gallery of St Paul’s Cathedral, they can exist for light and for other waves, with important applications in nondestructive testing, lasing, cooling and sensing, as well as in astronomy. Whispering-gallery waves were first explained for the case of St Paul's Cathedral circa 1878 by Lord Rayleigh, who revised a previous misconception that whispers could be heard across the dome but not at any intermediate position. He explained the phenomenon of travelling whispers with
St Paul's Cathedral intense piety. In March 2010, Flare II, a sculpture by Antony Gormley, was installed in the Geometric Staircase. In 2007, the Dean and Chapter commissioned Martin Firrell to create a major public artwork to mark the 300th anniversary of the topping-out of Wren's building. The Question Mark Inside consisted of digital text projections to the cathedral dome, West Front and inside onto the Whispering Gallery. The text was based on blog contributions by the general public as well as interviews conducted by the artist and on the artist's own views. The project presented a stream of possible answers to the