House of Many Arches is a gut renovation of a 35-year-old house in Japan. With the desire for more openness and comfort for a new type of work-live space, strategically allocated structural arch walls provide an overall spatial fluidity across different rooms allowing to contract and expand without full separation. Natural light freely spills throughout while subdividing residential programs without obstruction. Arch openings with painted intrados highlight different characters of the space revealing unique relationships with adjacent spaces without breaking the overall continuity of space.