JA 110 is a special feature on building sites. Building sites are the places where projects are being realized. They are where the ideas of architecture begin to appear in their forms. This issue shows the trials and errors of architecture and the architects during the construction process. What do Japanese architects read, consider and judge on site? Movements are actively taking place via events at the worksite. Gazing at what is happening, there may be a moment when the consciousness of the architects and the ideas sublimate into space to the architecture. In this journal, together with 17 recent works, we will post on-site photographs and discourses of the architecture of the 1950s and 1980s. It explores the relationship between things created by architects and thinking from the old and new sites.