The Attention for studying the internal space and the internal surfaces of the religious buildings especially in the Qibla`s large sitting room-was great , we find that the marble covers and the wooden decorated ceilings were made, therefore great concern was paid to the internal elements necessary for performing the prayers like the Mehrab ; Pulpit ( Minbar ) ,Terrace (Dekka)  and the chair of Quran .

The external fronts were not took care of the same way as far the internal walls . Also inscription was used with all its different sorts as a decorative element in the walls of the internal fronts or the walls of the large sitting room ( IWAN) or around the Mehrab .Also engineered and plant decorations were used depending on its effect of variation between light and shadow .