The twin page slumps

Claim (verbatim)

The twin page slumps. Double-page Qur'an frontispieces are designed as mirror twins but executed in sequence by the same team, and fatigue plus deadline land on whichever page came second. If workshops shared a standard order of operations — something no surviving treatise records — then across many manuscripts the same side of the opening should show lower execution precision. A corpus-consistent direction of asymmetry would recover an invisible workshop rule from geometry alone.

Prediction clause (verbatim)

Primary clause (the verdict follows it): in at least 25 digitized paired frontispieces from Mamluk, Ilkhanid, and Ottoman Qur'ans, a blinded precision score — deviation of strapwork intersections from the best-fit shared grid — favours the same side of the opening in at least 70 percent of pairs; the load-bearing claim is consistency of sign across the corpus, not the mere existence of asymmetry. Secondary clause: the weaker page shows denser visible corrections and fewer compass prick-points where imaging permits.

Kill-dataset (verbatim)

Kill: the British Library's fully digitized Sultan Baybars Qur'an (Add MS 22406-22412) and the digitized Qur'an frontispieces across the British Library and BnF online collections.

Novelty / leakage triage

provisional — model-triaged, shepherd review pending

A provisional first pass authored by the model (Opus), not yet confirmed by the shepherd. It carries the same dated-search requirements as an authoritative verdict but is excluded from every headline figure and cannot underwrite a prediction until a shepherd confirms it. Provisional reading: Adjacent (closely related prior work exists).

Execution asymmetry between the two halves of a mirror-designed double-page frontispiece is documented case by case -- the St Andrews Qur'an study finds systematic right/left differences in calligraphy layout, verse-marker execution and background gold between the paired pages -- and the 'God alone is perfect' convention of deliberate subtle asymmetry is a competing established reading. Not located: the item's corpus-consistency claim, which carries the verdict -- that a blinded strapwork-precision score favours the SAME side of the opening in >= 70 percent of >= 25 paired frontispieces (recovering an unrecorded workshop order-of-operations from geometry), with the weaker page showing denser corrections and fewer prick-points. Per-pair asymmetry documented; the corpus-consistent directional-fatigue rule is unrun (and competes with the deliberate-imperfection reading).

• University of St Andrews Special Collections, 'The St Andrews Qur'an Part Two: Deconstructing a Frontispiece' — Measurable right/left execution differences within a single paired frontispiece.
• British Library digitized Qur'an frontispieces incl. the Sultan Baybars Qur'an (Add MS 22406-22412) — The kill dataset for the corpus-consistent same-side precision test across many pairs.

Predictions

No prediction registered yet.