House of Many Arches is a gut renovation of a 35-year-old house in Kobe, Japan. With the desire for more openness and comfort for new type of work-live space, strategically allocated structural arch walls provide an overall spatial fluidity across different rooms allowing the rooms to contract and expand without full separation. Arch openings with painted intrados highlight different characters of the space revealing unique relationships with adjacent spaces without breaking the overall continuity of space. The much-needed natural light freely spills throughout second floor space due to the insertion of structural arch walls, which subdivide residential program without obscuring light and views.