The windows or slides divided into three parts. In sacred romanesque and gothic architecture also a gallery inside the church, in the thickness of the wall (as opposed to the matroneum). This corridor runs between the windows zone and the arcades zone, in the nave, chancel and transept. It is open to the interior of the triangular arcade. A row of arcades was also stripped of the gallery and overturned by windows in the outside wall. Deprived of both galleries and windows, creates so called blind triforium.