Matisse, La Leçon de piano
Henri Matisse, 1916The foundational read: figure/ground instability and single-channel figures. The first calibration pole.
The corpus
Ten deep single-work reads, one matched painting pair, one born-digital pair, and a 48-frame within-engine ensemble. Each has a lab book — the working record, with corrections and retractions intact — and a critique — the essay it earned. Together they are the instrument's calibration: every reference value it quotes traces back to one of these.
The foundational read: figure/ground instability and single-channel figures. The first calibration pole.
The fourth domain, and the epistemically cleanest case: the pixel array is the artifact, no reproduction chain. One prompt family spanned the corpus's full R_spatial range — arrangement, not engine statistics, sets that axis.
The corpus's first draw-variance measurement — claims at cohort level, in the register's first cohort-range rows. Showed the centred-emblem basin is conditional on engine and prompt, not a property of generated images as a class.
The deepest shadow-key in the corpus, on a composition that buries its nominal subjects. Earned the annular and dark-on-dark zone-read limits (I-18/19) and the third null family — a figure-position shuffle that withdrew a verdict the phase-scramble had passed.
The adversarial limit: an edge-and-gradient instrument aimed at a painting built to have near-zero internal structure. Five control rounds retired four first-draft "records" (I-20), separating a clean ~1.7° hand-tilt from the century's decay. Earned the silent-zeroing fault I-23.