In Kouvola, there was Finnish Housing Fair in summer 2019. A Dekolaku-house has several white Liune doors. The interior doors sliding into the wall really increases the space in this house. The corridor 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.