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 “Elevation of an Altar Mensa” — 40 records examined, 0 dropped by the rights gate.
Archives queried 2026-09-03 15:58 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.The Metropolitan Museum of Art: HTTP 403 from collectionapi.metmuseum.org. Results from the remaining archive are shown unchanged — nothing is substituted for a source that did not answer.
Elevation of an Altar Mensa
Artist not stated in the record · 1720–50
Project for an Altar
Artist not stated in the record · 1725–1750
Design for the Elevation of an Altar
Artist not stated in the record · 1550–80
The elevation of an altar with alternative suggestions
Artist not stated in the record · 1775–1800
Project for the elevation of an altar
Artist not stated in the record · 1750–1780
Project for an Altar
Artist not stated in the record · 1750–1775
Design for an Altar Mensa
Giovanni Battista Piranesi, Italian, 1720–1778 · 1764–66
Project: the elevation of an altar, intended to be executed with colored marbles
Artist not stated in the record · 1770–1790
Design for an Altar Mensa
Giovanni Battista Piranesi, Italian, 1720–1778 · 1764–66
Designs for an Altar Mensa
Giuseppe Barberi, Italian, 1746–1809 · 1750–80
The elevation of an altar
Artist not stated in the record · 1730–1760
Elevation of an altar in an apse
Artist not stated in the record · ca. 1775
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. HTTP 403 from collectionapi.metmuseum.org. No records from this archive are shown for this query.Unavailable - Smithsonian Open Access API (api.si.edu)Rights field:
content.descriptiveNonRepeating.metadata_usage.access. 3823693 matched · 40 examined · 0 dropped by the rights gate. Kept only where metadata_usage.access === "CC0" and an image resource was published.12 shown
These figures describe the pass run at 2026-09-03 15:58 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.