I am taking an exerpt of what I learned within a REIKI Seminar that may provide some insight.
UNDERSTANDING REIKI.
KI follows thought and breath
Blood follows KI
Like an amoeba, our reaction to a stress causes us to contract emotionally,
physically, spiritually, mentally
High vibration is health.
It is expansion, awareness, warmth, life.
Low vibration is sickness, a stagnation or blockage of blood, thought, breath and KI
It is a contraction, coldness, death
REIKI means Spiritual KI
KI is matter at the verge of becomming energy
energy is at the verge of becoming matter.
KI is the binding force, the vibration created through the interaction of Yin & Yang.
Solid, Liquid, Gas
Molecules vibrating at different rates of speed
Raising vibrations increases circulation & health of blood, thought, Ki and breath
REIKI is a high frequency energy used to transform and unlock diseased KI
Like a moist sponge tapped into the source of water
When we touch another sponge we first feel rejuvenated, The water flows at the speed it is needed. The water stops flowing when the sponges are saturated...
So to answer the question, I would say that Chi feels like an absence of thought (internal dialogue) combined with a direct feeling or understanding of the present moment. I think the heat is always there, which is why it can be accessed at any time with Intent. The difference again is the deliberate activity of making it so. In Tai Chi (or the little that I have experienced), when I am doing the motions to learn a move, I feel nothing, because I am thinking of getting the motion down, but when I feel the move and meditate while doing it, I am feeling myself in another state of mind, one that is so focused and energetic, that I can do things that under ordinary circumstances, would be almost impossible. (like the zone, etc)
Farang - Larry