S Library is a new library building developed within an old school. The site facing the school¡¯s playground sits atop the existing, rigid order of the school¡¯s architecture. While school architecture of the past adopted a strict hierarchy, with a playground built as an authoritative structure placed on top of a high platform, S Library loosens the boundary between the ground and architecture, letting the building naturally slip down to the playground. This architecture of more flexible boundaries allows us to look not only at the relationship between the ground and architecture, but also at the potential connections between people and architecture.