It is an irony that impermanence makes us enjoy a simple thing all the more. I doubt that one could possibly find a way to stay in that cusp of uncertainty for a prolonged time, to sit right on that edge would likely tear a psyche apart.
Perhaps the goal of living on the edge, perpetually dipping ‘one foot in’, to be able to step with ease into the depths of flow… is madness. Perhaps the only result of that achievement would be a psyche torn apart.