Explaining the evolution of the use of moqrans in the architecture of Khorasan with the approach of investigation in the religious buildings of Mashhad

The use of moqrans as a decorative symbol has long been intertwined with the architecture of this land in Iran, and the architect has decorated the roof of the building using various methods of using moqrans and decorated the sky with the use of moqrans. The use of regular geometry, which is the essence of Iranian architecture, is an important principle in the use of moqrans and its execution, and the proportions used in the implementation of moqrans express nothing but the use of the special principles of traditional architecture of this land. Throughout the history, like other decorative arts, moqransazi has evolved in terms of the number of uses and the addition of materials. With the beginning of the building of mosques and schools of religious sciences in new and unique forms, this decoration opened a precious place for itself, and gained great importance. The architecture of Khorasan, due to its ancient history, is a testimony to the architect's skill in using types of moqrans in the traditional buildings of this country. Muqrans in different periods and also the diversity of its use in this city have been discussed From the point of view of the amount of usage, the Safavid and Timurid periods have the most use of moqrans, and from the perspective of the variety of use, the hanging moqrans has the highest amount of use in different historical periods, and the front moqrans has been used to a considerable extent in the Qajar era.