Correct! For drying i fichi d'India, prickly pears or figs, in the sun. 2. What are the roofs of the trullo made of? From cristalleria, fine glass, to make the homes sparkle in the sun. From ciottoli bianchi, white pebbles, arranged in special patterns. From a special insulating stone called chiancole, which keeps the trullo warm in the winters and cool in the summer.

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