 Meanwhile, the Lady Chapel of Ely Cathedral has an unsupported stone ceiling approximately 30 feet by 80 feet, using a star formation of lierne vaults and bosses.The late mediaeval period saw an unequalled development in church architecture in England.Walls became thinner; solid buttresses became more elegant flying buttresses surmounted by pinnacles; towers, often surmounted by stone spires became taller, and more decorated, often castellated; internal pillars became more slender; unsupported spaces between them wider; roofs, formerly safely steeply pitched became flatter, often decorated with carved wooden angels and a bestiary, where they were steep they were supported by carved hammer beams; windows occupied more and more of the wall space; decorative carving more freely flowing; figures multiplied, particularly on the west fronts of cathedrals and abbeys.