Karesansui was introduced to Japan during the Han Dynasty

Quick answer：

Karesansui, a Japanese dry landscape garden style, is believed to have been introduced to Japan from China during the Nara period (710-784 CE), not during the Han Dynasty. It is influenced by the Chinese Zen Buddhism, which emphasizes simplicity and the natural elements. The concept of Karesansui became particularly popular during the Muromachi period (1336-1573 CE).