Chinese architecture has some distinct structural features compared to Western architecture. Traditionally, Chinese buildings use post and beam construction where columns support the roof and walls act as enclosing screens with roof overhangs. This type of construction was used for simple homes as well as large palaces. Another characteristic is the curved roof, enabled by the Chinese beam-frame construction, which developed further by the Tang Dynasty. Brackets are also used to support the decorative curved roofs. Over time, styles changed but the underlying structural approach of post and beam construction remained central to Chinese architecture.