|Literal meaning||memorial archway gate|
|Literal meaning||memorial archway edifice|
A Paifang, also known as a pailou, is a traditional style of Chinese architectural arch or gateway structure. Originally derived from Indian Torana through the introduction of Buddhism to China, it has evolved into many styles and has been introduced to other East Asian countries such as Korea, Japan, and Vietnam. 
The word paifang ( Chinese: 牌坊; pinyin: páifāng) was originally a collective term for the top two levels of administrative division and subdivisions of ancient Chinese cities. The largest division within a city in ancient China was a fang (坊; fāng), equivalent to a current day precinct. Each fang was enclosed by walls or fences, and the gates of these enclosures were shut and guarded every night. Each fang was further divided into several pai (牌; pái; 'placard'), which is equivalent to a current day (unincorporated) community. Each pai, in turn, contained an area including several hutongs (alleyways).
This system of urban administrative division and subdivision reached an elaborate level during the Tang dynasty, and continued in the following dynasties. For example, during the Ming dynasty, Beijing was divided into a total of 36 fangs. Originally, the word paifang referred to the gate of a fang and the marker for an entrance of a building complex or a town; but by the Song dynasty, a paifang had evolved into a purely decorative monument.
It is suggested that the Chinese paifang may have been derived from the torana temple-gate in ancient India,  though it has taken on traditional Chinese architectural characteristics such as multi-tiered roofs, various supporting posts, and archway-shapes of traditional gates and towers.  
During the Tang dynasty, it was called a wutoumen (烏頭門; wūtóumén; 'black top gate'), because the top of the two posts were painted black. A wutoumen was reserved for officials of rank 6 or higher.
The construction of wutomen was standardized in the Yingzao Fashi of the mid Song dynasty.  It consisted of two posts and a horizontal beam forming a frame and two doors. By the Ming and Qing dynasties, it was called a pailou or paifang, and evolved into a more elaborate structure with more posts and gates, with a superstructural gable on top; the highest rank was a five gate-six post-eleven gable pailou.
Paifangs come in a number of forms. One form involves placing wooden pillars onto stone bases, which are bound together with wooden beams. This type of paifang is always beautifully decorated, with the pillars usually painted in red, the beams decorated with intricate designs and Chinese calligraphy, and the roof covered with coloured tiles, complete with mythical beasts—just like a Chinese palace. Another form of paifang is in the form of true archways made of stone or bricks; the walls may be painted, or decorated with coloured tiles; the top of the archways are decorated like their wooden counterparts. Yet another form of paifang, built mainly on religious and burial grounds, consists of plain white stone pillars and beams, with neither roof tiles nor any coloured decoration, but feature elaborate carvings created by master masons. Another form is in the Han dynasty style, and is two matching towers, such as in Beihai.
A paifang photographed in Gansu Province (1933).
Paifang of Wuhan University (1920).
Decorated paifang at the Summer Palace in Beijing.
Colour glaze gateway at Puotuo Zongcheng temple, Chengde.
Paifang in Xidi.
Pailou at Dunedin Chinese Garden, New Zealand.
Pailou at the entrance to Qiandao Lake Scenic Area
Paifangs at the entrance to Yonghe Temple, Beijing
Pailou at the China Martial Arts Hall, Jinshitan, Dalian
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