The cone of experience: the experiencing is at the vertex and the experienced at the outermost reach and the experiencer in between. The experiencing is also known as witness or subject but descriptions do not properly apply to it. The point of the metaphor is that experiencer and experienced are only relatively distinguished. When there is experiencing then a sort of mirage appears seemingly prior to the experienced which is taken to be the experiencing self, and which brings with it the idea of a measurable gap separating the experiencer from the experienced. Identifying  as experiencer you are aware of this separation since you are already in measure, while the experiencing is a dimensionless point without measure. As experiencer you have the sense of an outer reach directed towards the experienced and an inner reach which is you experiencing you experiencing you experiencing and so on endlessly. Engagement is in front of the experiencer and disengagement is behind it. The experiencer has qualities, is dull or bright, broad or marrow, fast or slow, distinct or diffused - all of these qualities are relative and are of importance only in relation to the experienced. The experiencing has no qualities and doesn't change. The refracted nature of the experiencer makes it appear to be what is experiencing, but this is only in relation to the experienced of which it is a part. The experiencing is the sole source of energy but the experiencer is the point at which the energy appears to be at a maximum. As if a silent energy breaks out into appearance and then fades into a mere glow and the experiencer is the inner edge of the event horizon and the experienced its fading ember.