In the thread “Bagua Starts”, I started to lay out how the Bagua diagram represents the change from spirit to manifestation and manifestation back to spirit. The trigrams represent stages of that change. The martial art of Bagua Zhang is an application of those energies: practical science if you will.
From a meditation perspective I think you would talk about the progression jing, chi, shen, wu, tao, and I would organize the material in a very different way. The trigram energies would be the same, but I’d look at the three lines of the trigrams as though they correspond to the three tan tiens, the space in the middle of the diagram as emptiness, wu, and the space the Bagua diagram resides in as representing the tao.
This is step 6 in “Liu’s Overview”, http://www.energyarts.com/forum/liu-hung-chiehs-overview
I’m still convinced that the lower tan tien connects to and controls all of the energies that jing refers to. When you unify the body through all of the neigung elements, it begins in the lower tan tien. After working with the lower tan tien your energy will fill and begin to open the middle tan tien. You then work with the middle tan tien and it will eventually fill and spill over into spirit. This will eventually open the possibility of understanding emptiness: “For spirituality, learn about the chi of spirit and emptiness so you can eventually understand the chi that enables you to know who you are.”
All of this leads you to step 7 and the tao where you eventually understand the nature of the universe.