"Ji", a kind of Chinese folk puzzle game and the concrete evolution of the traditional timber structure, is shaped by internal masterly constructed mortise-and tenon connection which is easy to disasemble yet hard to assemble.
The separation and integration of "Ji" is full of the oriental philosophical connotation. In architectonics, "Ji" not only represents the structure of the architecture, but also embodies the ingenious combination of time and space, metamer and the whole, as well as shape and function. The ingenious application of "Ji" can be found from Chinese traditional architecture to urban planning and construction and it can also be found in the ideal for life and practice, etc. It may be said that " All things are out of "Ji",and fall into "Ji".(Photos by Fang Pei, english.eastday.com)