Another sightseeing is Scenic Openings

Jingdong in Chinese language lessons or “scenic opening” is the general term for fancy gates and windows，a feature of the national art of the Chinese architecture．Usually found in parks and private gardens，scenic openings make part of the landscape or provide picture frames，which you can learn in Chinese language lesson, as it were，to natural scenes while serving their proper practical purposes．

Fancy gates may be of any form，round，square，oval，a vase，a crescent，a bay leaf，a lotus petal，or a garland．On either side of such a gate are usually planted bamboos，flowering plants and grass and occasionally also rockeries．Leading to and through the gate is sometimes a pebbled pathway with flowery patterns．Thus beautiful scenes are created with the fancy gate as the focus．

Fancy windows，likewise，may be built in various shapes，round， oval，a drum，a crescent，a polygon，an open book，a bay leaf，or a flower．And as a rule they are fixed on fancy or corridor walls in pleasure gardens and，through them as picture frames，sightseers may view scenes on the other side，which change as they walk on． Noteworthy is the type of scenic windows called lou chuang in Chinese language learning of lessons or “hollowed window”．

They may be constructed of tiles or bricks，wood or stone carvings，leaving openings of geometric patterns and decorated with carved through human or animal figures．Strollers，through the openings of such windows，will get fragmentary and changing glimpses of the view across the wall．The idea of the lou chuang in the Chinese language course．probably an artistic conception unique to the Chinese architecture，has recently been extensively adopted for modern buildings such as art galleries，cultural centers，class residences．They pleasing sights as well．exhibition halls，an shops，and certain high help ventilation and interior lighting，and create.

Source: 

http://wangyuliang.blogdetik.com/2014/12/19/another-sightseeing-is-scenic-openings/