Open & Closed is a minimalist house located in Seoul, South Korea, designed by OBBA. The house consists of three floors, and each becomes a separate volume; mother’s private space on the ground floor, a shared space, e.g., living room, dining room, and kitchen, on the second floor, and the son’s family on the third floor. The architects deployed the house closest to the north-west end of the site, so that it reduces the site coverage area whilst securing enough height of the building. The house is well-lighted as it is sufficiently distanced from the southern property line, and this gives an enough wandering space for the client’s mother.