File:Crane Dasan JeongYakyong Josun Dynasty, Korea.jpg

English: This is the model sculpture of old crane which was invented by Dasan Jeong Yakyong who was a great scholar in Josun Dynasty in Korea. This crane is one of the result of his philosophy 'Sikhak (Practical Study) and it was used for Hwasung Fortress construction work. Visitors can find it nearby Silhak Museum in Gwangju county, Gyeong-gi Province in Korea.

The inventor Jeong Yakyong / Jung Yak-Yong (5 August 1762 – 7 April 1836), often simply known as ‘Dasan’ (茶山, one of his ‘ho’ / pen-names meaning ‘the mountain of tea’), was born on the 16th day of the 6th lunar month, 1762, in Gwangju county, Gyeonggi province, and died there on the 22nd day of the 2nd lunar month, 1836.

He was one of the greatest thinkers of the later Joseon period, wrote highly influential books about philosophy, science and theories of government, held significant administrative positions, was a close confident of King Jeongjo (ruled 1776-1800), and was noted as a poet.

His philosophical position is often identified with the Silhak (practical learning) school, and his concerns are better seen as explorations of Neo-Confucian themes.