When one talk about ''Kan & Li'' , one is talking about Jing, Qi, Shen
, which are frequently mentioned in writing on Taichi. ''Kan & Li '' meditation is one of the way to transform Jing, Qi, to Shen.
These 3 are offen quoted in other maxim of Internal martial arts like Bagua and Xingyi. All high level internal gongfu are attained when one is able to do these transformation. It is also same if the Master mentioned training to activate the '' small mirco-orbit'' and the ''big mirco-orbit'.' Different Masters uses different method and terms to emphasis this very important essence of training. It can be very obscure and esoteric to many, which is the reason why is it often neglected and due to this neglect, not many can achieved high level in Taichi and other IMA.
I would really like to encourage any person to look at it seriously.