After full-scale war broke out, Japan promoted the East Asian Co-Prosperity Sphere, and hoped that architecture would express "the Oriental spirit." This was the origin of the Imperial Crown architecture, with its colored glazed tiles on the rooftops.
由於戰爭爆發後，日本標榜「大東亞共榮圈」，希望建築物能表現「東方精神」，屋頂鋪琉璃瓦的冠帽式建築於焉興起。