At the moment of supreme focus there is nothing there. The dichotomy, that is, between experiencer and that experienced disappears. We say, “lost in the moment…” to explain this. What happens is a melding of the ego, the mode of the experience, and that being experienced. He who loves his God disappears, God disappears, all remaining is “love of God”, for instance. In a “Zen” sense, if you take the well known phrase, “when hungry, I eat” and change it to “when hungry, eating” you have a sense of what is meant here, assuming the eater focuses on eating to the total and absolute exclusion of all else. The void, into which all stimuli disappears at the moment experience arises, for one who has total concentration, subsumes the whole of creation in a kind of quasi death. This is rapture, for the acolyte, pleasure, for the seeker thereof, adventure, for the mountaineer, and so forth.