Granularity of experiencing is bewilderingly lacking in any underlying continuity when it comes in at a certain low pitch of affective attunement, in which case it is of the nature of suffering. If and when attunement changes, then, as the clouds dissipate and the sky is again visible, the continuity of witnessing is restored and tension is released. Everything depends on that affective pitch over which you have little control. That you are the seat of affect, which can indifferently be called dukha or jouissance - positive and negative valence amounting to the same - is another prior enablement, a setting of foundation. It is not a ground because it is not conceptual, feeling is rooted in prior feeling with no beginning. You see it only from the side, your seeing is to the side of it as centre.