Gauge
"Gyoid" is a philosophical book by Chosun Dynasty philosopher Choi Han Ki. It was written in the early 1830s and consists of three volumes of "Shin - gi - tong" and six volumes of "guessing rock". "Shin-kyung Tong" deals with the problems of the world's origin and development, and the issues of human sense, senses, and cognitive abilities. The "guessing rock" mainly deals with the problem of reasoning in the recognition process, and the socio-political problem is also mentioned constantly. Choi 's unique view of "being able to wonder" takes an important place in understanding his thoughts.