Found in the North Transept of the Minster, the Five Sisters Window contains the largest amount of Early English 'grisaille' glass in a single window, anywhere in the world. The window was completed in 1260. It consists of five lancets, each of which is fifty feet high and five feet wide, and contains more than 100,000 pieces of glass. 'Grisaille' means 'grey in background', the groundwork of this type of glass being greyish-white (from http://www.yorkminster.org )