Casa Batlló's dragon-inspired façade, with its 300,000 trencadís tiles, is 50% costlier per square meter than the typical Barcelona apartment block—yet it yields 4 million annual visitors. Gaudí replaced the conventional straight wall with a 12-meter undulating surface, using no right angles across all six floors. This design outperforms #8 Metropol Parasol's wooden ribs in thermal efficiency by 15%, thanks to a double-skin ventilation system that reduces summer heat gain. The rooftop's ceramic chimney pots, representing spears in Saint George's dragon, remain a defining Barcelona icon.
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