Jai Sri Ganesha,
There are eight knots of nature which binds the spirit in journey for a cause,
Five material knots with three eternal, which parts with function of the body centered with spirit,
From Body to Karma and Karma to body is the cycle which goes on in journey, Three kinds on body resolute the spirit with different task,
Gross Body is meant to activate truth of karma in practice, subtle body assist to felicitate spirit unto resultant of Karma, Karana Sharir or sub-subtle truth, a reserve shall for spirit for hidden and mystic cause at changeover,
May Lord bless all,
Thanks please