In Kouvola, there was Finnish Housing Fair in summer 2019. A Villa Lande -house from the collection of Ainoakoti-houses has beautiful white Liune doors. The interior doors sliding into the wall between bedroom and walk-in closet really increases the space. The roomr is functional when nothing turns in the way. 

Liune door leaf slides inside a normal-sized partition wall. So it does not need that thick of a wall, just an ordinary one is enough. It creates more space because it doesn't need to turn. Building with Liune is efficent and controlled.