In Seinäjoki, there was Finnish Housing Fair in summer 2016, and there is a house called Nuuka. An ecological house Nuuka got more  light and space in living room with Liune double doors.

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.

Read more about this case (in Finnish) here.