Whispering-gallery wave known as surface plasmons has been demonstrated in the form of whispering-gallery waves, and likewise for exciton-polaritons in semiconductors. Galleries simultaneously containing both acoustic and optical whispering-gallery waves have also been made, exhibiting very strong mode coupling and coherent effects. Hybrid solid-fluid-optical whispering-gallery structures have been observed as well. 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,
491 Gallery Vertigo building was not subject to sale. In the spring of 2016 the former gallery building and its community garden were demolished. The Vertigo building was also sold. 491 Gallery The 491 Gallery was a squatted social centre and multi-disciplinary gallery in Leytonstone, London, England, that operated from 2001 to 2013. Taking its name from its street number, 491 Grove Green Road, the former factory was home to a community-led art organisation and served as an exhibition space for a diverse range of artists of different origins working in varied media. It contained a range of art and music studios,