Onegaishimasu. In my experience, to have or experience 'no mind' is to focus on nothing in particular, to put your mind nowhere, thus taking in the big picture. Scientifically, it is like peripheral vision, only with your thought.
Thank you, Mark. That idea of peripheral vision strikes a chord in me. When "no-mind-ing" I'm definately accutely aware of my periphery...that is to say, the central thrust of my attention seems to go there.