Calligraphy

Because of the profound reverence given by Muslims to the Qura’an calligraphic verses from the text are used to decorate walls and ceilings in religious building.
Because of Muslims' profound reverence for the Qur'an, the art of calligraphy was developed among them from the earliest times to a very high degree. The use of calligraphy in architecture is an element of decorating that has at all times unified buildings throughout the Islamic world.
There are two main styles of calligraphy used in architecture: cursive styles called Naskhi, which are often seen with floral arabesque decoration; and the more geometric styles, called "Kufi".Calligraphy is closely linked to geometry. It's often referred to as the "geometry" line, implying that the proportions of the letters, including the curved strokes, are all governed by mathematics.
Inscriptions on buildings are generally written in an angular, sober and monumental script. However, the ranges of variation between the cursive styles vary from century to century, and from region to region.