I shall try to be brief here as i speak on what I know of Musashi's emptiness. A friend of mine described it best to me as he tried to convey to me the act of expressing a movement without thinking about it. "A glass is a glass if it has water in it or not. So you are a glass. As you are here in Nature, you are filled. A glass that is filled cannot be filled anymore." This suggests that one must empty the self of that which was learned when facing a task. There can be no presuppositions, no plan... merely that which is being poured into your senses, filling you. That which you have learned is now part of the glass... part of you, it supports you and helps to bear what is now pouring in. In short, there can be no doubt... only reception and result. The mechanism is all you. Your training, your physical abillity, your soul... all of this shapes your expression. Expression is shaped by that which fills you. Regards...