unique challenge to the designers. A solution was created that called for the circle to be divided into smaller shapes that would make it simpler to design and create. Curves were drawn within the window which created four distinct areas of the circle. This made the spaces within the circle where the tracery would go much smaller, and easier to work with. This window is also unique in that the focus of the tracery was shifted away from the centre of the circle and instead placed in other sections. The glazing of the window was difficult as the tracery for many of the same reasons; therefore, the designers cut back on the amount of iconography within the window. Most cathedral windows during this time displayed many colourful images of the Bible; however, at Lincoln there are very few images. Some of those images that can be seen within the window include saints Paul, Andrew, and James. Vaults One major architectural features of Lincoln Cathedral are the vaults. The varying vaults within the cathedral are said to be both original and experimental. They demonstrate the experimental aspect seen at Lincoln. The vaults differ between the nave, aisles, choir, and chapels. Along the North Aisle there is a continuous ridge rib with a regular arcade that ignores the bays. In the South Aisle there is a discontinuous ridge rib that puts an emphasis on each bay. The North West Chapel has quadripartite vaults and the South Chapel has vaults that stem from one central support column. The use of sexpartite vaults allowed for more natural light to enter the cathedral through the clerestory windows, which were placed inside of each bay. Saint Hugh's Choir exhibits a series of asymmetrical vaults that appear to almost be a diagonal line created by two ribs on one side translating into only a single rib on the other side of the vault. This pattern divides the space of the vaults and bays, placing the emphasis on the bays. The chapter house is a decagonal building with a single, central column from which twenty ribs rise producing unusual vaulting. Each area of Lincoln can be identified solely by the different vaults of the space. Each vault, or each variation of the vault, is unique. The vaults are attributed to French-Normand master mason Geoffrey de Noiers. de Noiers was succeeded by Alexander the Mason, who developed the nave's