He might have been a genius, but he was also a perfectionist: the mosque of his imagination was perfect, and it agonised him to contemplate the compromises that would be involved in making it real. Even the greatest of builders would inevitably fail to reproduce his plans absolutely faithfully; nor would he be able to protect his creation from the ravages of time – from the physical decay or marauding armies that would eventually reduce it to dust. Stepping into the world of finitude, by actually building the mosque, would mean confronting all that he couldn’t do.