Design themes & concepts change day by day. Sometimes we have traditional art on the screen and sometimes the modern one.
The question that arises is why Iranian architecture still has the same old theme; although the design changes, the concept remains the same. While going deep towards the reaserch sites we come to know that it is because Islamic art & architecture is applicable on all ages as well as different catagories.
it's a bit psychological and political. Remember Nazi regime.
i thinks its about iranian learning and education system.Iran university system have big problem in architectural learning.they dont learn to student how to learn architecture.