The doors opening "like a book" are the practical and elegant solution in situations where conventional blinds are difficult to use, it is the case of facades with openings close, to avoid the problems of overlapping of the doors, and situations of obscure attics and attic areas , where the shutters have the traditional problems in opening because of the roofs.
The hinges allow the shelter patented ISAM obscurantism within the thickness of the wall and ensure the opening of the door locking operations avoiding dangerous leaning from the window sill.
The doors which open in ISAM are an expression of personality: open or closed your house will not change appearance.