In the later Heian period (the mid-10th century to the 12th century), the sophistication of court culture and popularity of Amida Worship gave rise to a new style: gentle, calm, and refined features with more attenuated proportion. Sculptors Japanized faces of images. Pure Land sect(Amida Worship) leader Genshin and his work "Ōjōyōshū" influenced many sculpture. The masterpiece is the Amida Buddha in Byōdō-in in Uji by the master Jōchō. He established a canon of Buddhist sculpture. He was called the expert of yosegi zukuri technique: sculptors became working with multiple blocks of wood, too. This technique allowed masters atelier production with apprentices. In school, a grandson of Jōchō established an atelier which worked with the Imperial Court in Kyoto. a discipline of Jōchō, also established Sanjyō-Atlier in Kyoto.