Huen Thsang, a pioneer of Chinese derived Hetu-vidya, was also the representative of the great achievementof indian Hetu-vidya at that time, yethedidn't write his ownwork on Hetu-vidya.
Researcher Valentin Huen explains that "graphical user interfaces are perfect for modifying systems, " but operating them on a day-to-day basis is much easier using tangible objects.
From there, Huen mapped various songs onto different positions of the knob, allowing him to control his playlist by moving it -- a simple, manual interface for selecting music.