There are various kinds: circular, oval, rectangular, square… Regardless of whether they are framed or not, the important thing is that the size is adequate for the size of the room and that the mirrors are placed on one of the walls lengthwise and not otherwise because you could obtain the opposite effect and the space would look even more narrow. A large mirror can decorate the wall alone, while smaller ones need to be combined in several in order to give it a personal touch.