Several decades of Derrida followed by two glorious years of Harman have convinced me that boundaries in the ontic world are never thin and rigid, but always ambiguous, nay riddled with contradiction and anomalous entities.
"Alive" for instance means in part "to have an ambiguous boundary contested in many ways."
But since Sorites and Zeno's paradoxes apply to anything at all in ontic space, all boundaries whatsoever are problematic.
Did I say no boundaries? No. That would also be the metaphysics of presence--a One arbitrarily subdivided.
There are no (thin rigid) boundaries, and no not-boundaries. I argued this in Ecology without Nature and The Ecological Thought.