The whole series in one object. The gap was never a point on a line — it has two axes. Lateral: the two shores it sits between (−1 / 0 / +1) — what kind of gap. Vertical: where in the stack it sits — what's above governs it, what's below constitutes it. One substrate, many varied versions, individuated by position. Click any cell.
Every gap sits between two poles: −1 and +1, with 0 the witnessing middle — not a wire, a gap. This is what kind of gap. It answers: between which two things? The lateral axis is the whole −1‖0‖+1 of the series — anode/cathode, sent/received, you/me, signifier/signified.
Every gap also sits at a level, bounded above and below. What's above governs it (the larger gap it's nested in, the witness). What's below constitutes it (the smaller gaps it's made of, the substrate). This is which gap — its address in the stack. The vertical axis is place-value: position = significance = governance direction.
The vertical axis isn't passive addressing — it carries the governance recursion. Governance flows downward: each level witnesses the level below it (max audits macro, macro audits micro). Constitution flows upward: each level is built from the level below it (macro is made of micros, micro of substrate). Every interior gap is therefore doubly bound — governing what's beneath it, governed by what's above it. Two boundaries, two roles, one cell.
This resolves "so many varied versions of the same substrate." There is one substrate — the gap-structure: two shores, a witnessing middle. It is instantiated at every level of the vertical stack, and each instance is individuated by its above-and-below — its place-value, its address. Same structure everywhere (it is invariant — that's why it's one substrate); distinct at every position (each has a unique above/below — that's why it's many varied versions). The gap is a digit in a positional system; the stack is the number; and the position is not just a coordinate but the governance direction itself. The whole series — witness, delta, kernel-27, lattice-of-lattices — is this one two-axis object, read at different cells.