This article explores the history and purpose of curved roofs in Japanese architecture, which have been used for centuries due to their aesthetic appeal, durability, energy efficiency and wind protection. There are several traditional styles of curved roofs, such as the "irimoya" or hip-and-gable roof and the "karahafu" or half-circle roof. Modern designs often incorporate steel or concrete instead of traditional wood or clay tiles. Curved roofs can last for decades with proper maintenance and care.