Compared with the Shah Mosque, the design of the Sheikh Lotf Allah Mosque is quite simple: there is no courtyard, and there are no interior iwans. The building itself consists of a flattened dome resting on a square dome chamber. However, in contrast to the simple structure of this mosque, the decoration of both interior and exterior is exceedingly complex, and in its construction the finest materials were used and the most talented craftsmen employed. Robert Byron wrote about this sight: I know of no finer example of the Persian Islamic genius than the interior of the dome: