In these days, many community-engaged art projects are developed everywhere in Japan. In postmodern\era, art project is often utilized by regional or national interest. The “Bokuto-Machimise” of\“Tokyo culture creation project” is a typical representative example. In this article, based on the long term\fieldwork of “Bokuto-Machimise” project and the author considers how the “art” space appears through\the artist's practice in the project. The author highlights the artist's emotion, though underpayed and\exploited, creates the moment of new spatiality between materiality of the product and audience.