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The Zigzag Market is a three-story semi-outdoor market structure in San Francisco, CA. The site of the project is the corner of Tennessee St and 22nd St in the Dogpatch neighborhood. The Dogpatch is located near the shoreline of the Bay and straddles a border between residential neighborhoods and a light industrial area. The concept is from analysis of ancient precedent and combine it with ramp circulation of parking-lot. Agora was a central public space in ancient Greek, which consists of stoas, and they can be understood as scattered bars with interactions among them. The concept is rearranging those bars along the continuous ramp system distilled from parking-lot. Just like bars scattered in 3D, they can have interactions with each other in space. Multiple activities can happen in the plaza on the ground floor that opens to the streets. Partially, commercial activities can happen in the spaces with slope to achieve the concept of changing eye-sight and adventurous experience in urban life. To allow people inside to explore inconvenient enjoyment. For the program on the ground floor, it will be multifunctional and with flexibility for citizens. Exhibitions, flea markets, and neo-retails can take place in the spaces that can open up and turn into semi-outdoor. The plaza, where people can have a sitscually on the stairs, will be a place for performances or public concerts. Semi-outdoor courtyards, where leisure, dining, and having coffee can take place, are spaces in between two stoa bars. Retail stores are mainly on the second floor. And the catering and library are on the third floor. The Roof floor is a greening park. The building will be constructed with steel structure with metal mesh as its elevation surfaces. The whole building is conveying the concept of light, transparent and temporary. Just like Anto Tadao said, architecture is an endless challenge that human beings fight against fateful destruction. So the building aims not to be monumental permanent, but to be something adventurous and ephemeral.