Art in Artisan Ep07

Beginning in the late 1970s, Korean media started to focus in on the works of one potter.
Because the method of pottery making had been passed on for generations for hundreds of years.
His name was Cheon Han-Bong, now 70 years old.
Sublimating common pottery into masterpieces of art - He is the master artisan of Korean traditional pottery.
Nowadays called 'Chosun Sabal', they are the very simple pottery ware, usually used as teacups.
Why is it that the simple pottery he makes is recognized as such great pieces of art work in and outside of Korea?