 A further development was many shallow ribs radiating in a fan shape, so that visually, the appearance of the structural ribs is minimised, and the emphasis is upon the curving surfaces.These fan vaults were used successfully for narrower and lower structures such as the cloister at Gloucester Cathedral and the retrochoir at Peterborough, before being employed on the high vaults at the Chapel of Kings College Cambridge, and even even more elaborate form with pendant lanterns attached, at Henry VII's Chapel at Westminster Abbey.One of the most prominent features of Gothic architecture was the use of stained glass window, which steadily grew in height and size and filled Gothic churches with light and colour.