Text: Legend has it that jewels from Persia were ground up and mixed in with the mortar for one of the minarets, and that the incredible acoustics were achieved by embedding 64 hollow clay vessels facing neck-down in the dome.
Entailment: Persians improved the sound quality of their towers by leaving hollow spaces in the dome.
Contradiction: The Persian buildings were always falling down because they had so many holes in their domes.