The rooms are ajoined.

...
Doors between rooms: sliding, wing, folded doors between rooms. Solid interior doors.
...
Doors used between rooms in apartments are not a simple element of decor. They protect us from extra noise, allow us to stay alone and to keep away from total mess. Today the assortment of doors provided for interior installation is so wide that sometimes it’s difficult to make choice.
Kinds of apartment doors by the number of leaves

By the number of leaves doors between rooms are divided into:

* single-leafed interior doors – consist of one leaf;
* double-leafed interior doors – consist of two leaves;
* half-leafed door – the door with two leaves of different width;
...