OpenTwo archives, queried live.
Every record below comes from The Met or Smithsonian Open Access and was filtered on that archive’s own rights field before it reached this page. 12 shown for “Guillaume-Benjamin-Amand Duchenne de Boulogne” — 24 records examined, 0 dropped by the rights gate.
Archives queried 2026-09-04 12:24 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
Electro–Physiologie, Figure 64
Adrien Tournachon · 1854–56, printed 1862
Faradisation du muscle frontal
Guillaume-Benjamin-Amand Duchenne de Boulogne · 1854–56, printed 1862
Icono-photographique. Mécanisme de la Physionomie Humaine. Fig. 65
Guillaume-Benjamin-Amand Duchenne de Boulogne · 1854–56, printed 1862
Figure 18: Aggression, wickedness
Guillaume-Benjamin-Amand Duchenne de Boulogne · 1854–56, printed 1862
Figure 60: Fright
Guillaume-Benjamin-Amand Duchenne de Boulogne · 1854–56, printed 1862
Figure 83: Lady Macbeth, ferocious cruelty
Guillaume-Benjamin-Amand Duchenne de Boulogne · 1854–56, printed 1862
Figure 73: Head of Niobe
Guillaume-Benjamin-Amand Duchenne de Boulogne · 1854–56, printed 1862
Mécanisme de la physionomie humaine ou Analyse électro-physiologique de l’expression des passions applicable à la pratique des arts plastiques
Guillaume-Benjamin-Amand Duchenne de Boulogne · 1854–56, printed 1862
Figure 16: Expression of severity
Guillaume-Benjamin-Amand Duchenne de Boulogne · 1854–56, printed 1862
Figure 10: Showing the expressive lines of m. frontalis in a young girl
Guillaume-Benjamin-Amand Duchenne de Boulogne · 1854–56, printed 1862
Figure 27: Expression proportionally more pained
Guillaume-Benjamin-Amand Duchenne de Boulogne · 1854–56, printed 1862
Figure 45: Pain and despair.
Guillaume-Benjamin-Amand Duchenne de Boulogne · 1854–56, printed 1862
Where these records came from.
Two archives are wired, and only two. Each one is filtered on its own rights field — never on a title match, and never on the presence of an image file.
- The Met Collection API (Open Access)Rights field:
isPublicDomain. 50 matched · 24 examined · 0 dropped by the rights gate. Kept only where isPublicDomain === true and a file URL was published.12 shown - Smithsonian Open Access API (api.si.edu)Rights field:
content.descriptiveNonRepeating.metadata_usage.access. The archive returned no records for this term.0 matched
These figures describe the pass run at 2026-09-04 12:24 UTC, during this request. A completed pass is kept for 24 hours and replayed for an identical search, which is what keeps repeated queries inside Smithsonian’s 30-requests-per-hour allowance. A pass in which either archive failed to answer is never kept — an outage must not be replayed as though it were a finding about the catalogue.
Wikimedia Commons and the Library of Congress are deliberately not wired. Wikimedia was confirmed, on a live query, to return CC-BY material inside the same result set as genuine public domain works, and filtering it safely has not been designed yet. loc.gov was blocked by bot detection during the source evaluation, so its rights vocabulary has never been observed — and nothing here is built on a field nobody has read.
An image file is a rights claim. It never travels without its field.