{
 "room": "/leonardo",
 "title": "鏡書 · Read It in a Mirror",
 "made": "2026-10-17",
 "about": "Image records for the Leonardo room. Every image is a public-domain reproduction from The Metropolitan Museum of Art or the Art Institute of Chicago.",
 "interpretation": "Passages marked “A reading”, the English translation of the lizard inscription (from the Met’s published transcription) and the scale drawing are written for the room by Claude, Artbitrage’s AI collaborator.",
 "works": [
  {
   "id": "bear",
   "museum": "The Metropolitan Museum of Art",
   "museum_id": 459184,
   "artist": "Leonardo da Vinci",
   "title": "A Bear Walking",
   "date": "ca. 1482–85",
   "medium": "silverpoint on light buff prepared paper",
   "dimensions": "4 1/16 x 5 1/4 in. (10.3 x 13.3 cm)",
   "credit_line": "Robert Lehman Collection, 1975",
   "accession_number": "1975.1.369",
   "url": "https://www.metmuseum.org/art/collection/search/459184",
   "api_source": "https://collectionapi.metmuseum.org/public/collection/v1/objects/459184",
   "is_public_domain": true,
   "images": [
    {
     "file": "/assets/leonardo/bear.jpg",
     "bytes": 1105940,
     "sha256": "3d82e6b5d5e05628722315500c47eafb4146db1a45136d64cce065e3172ad701",
     "width": 2000,
     "height": 1543,
     "role": "full",
     "source": "https://images.metmuseum.org/CRDImages/rl/original/DP324213.jpg",
     "source_sha256": "95b8eaf48ad0309a48267b4e252422ac23488a9c5eb9d99cab99b5dee26fb1d9",
     "source_bytes": 2085743,
     "source_pixels": "2997×2313",
     "fetched": "Sat, 17 Oct 2026 22:33:11 GMT",
     "processing": "Resized from the Met’s 2997×2313 image to 2000 px wide with macOS sips (JPEG quality 86). No crop, no colour change."
    },
    {
     "file": "/assets/leonardo/bear-t.jpg",
     "bytes": 92019,
     "sha256": "1740097b06a8777e3d41ab8328b1267a9ebe53ad1864d198a1a809efcc9aa7bc",
     "width": 700,
     "height": 540,
     "role": "thumbnail",
     "derived_from": "/assets/leonardo/bear.jpg",
     "processing": "Resized with sips; also used in the scale drawing."
    }
   ],
   "rights": {
    "public_domain": true,
    "license": "CC0 / Public Domain",
    "reusable": true,
    "credit": "The Metropolitan Museum of Art, Robert Lehman Collection, 1975",
    "note": "Met API: isPublicDomain true (checked 2026-10-17)."
   },
   "context_source": "Museum label text on https://www.metmuseum.org/art/collection/search/459184, read 2026-10-17 in a headless browser; quoted and paraphrased with attribution."
  },
  {
   "id": "sketches",
   "museum": "The Metropolitan Museum of Art",
   "museum_id": 337494,
   "artist": "Leonardo da Vinci",
   "title": "Compositional Sketches for the Virgin Adoring the Christ Child, with and without the Infant St. John the Baptist; Diagram of a Perspectival Projection (recto); Slight Doodles (verso)",
   "date": "1480–85",
   "medium": "Silverpoint, partly reworked by the artist with pen and dark brown ink on pink prepared paper; lines ruled with metalpoint (recto); pen and brown ink (verso)",
   "dimensions": "7 5/8 x 6 3/8 in. (19.3 x 16.2 cm)",
   "credit_line": "Rogers Fund, 1917",
   "accession_number": "17.142.1",
   "url": "https://www.metmuseum.org/art/collection/search/337494",
   "api_source": "https://collectionapi.metmuseum.org/public/collection/v1/objects/337494",
   "is_public_domain": true,
   "images": [
    {
     "file": "/assets/leonardo/sketches.jpg",
     "bytes": 1957416,
     "sha256": "b769125a5c480254963748c17fba5c807b6410595c8d920c942975280512926a",
     "width": 1430,
     "height": 1692,
     "role": "full",
     "source": "https://images.metmuseum.org/CRDImages/dp/original/DP832657.jpg",
     "source_sha256": "b769125a5c480254963748c17fba5c807b6410595c8d920c942975280512926a",
     "source_bytes": 1957416,
     "source_pixels": "1430×1692",
     "fetched": "Sat, 17 Oct 2026 22:33:12 GMT",
     "processing": "Unaltered copy of the Met’s image."
    },
    {
     "file": "/assets/leonardo/sketches-t.jpg",
     "bytes": 154176,
     "sha256": "8c3d9ca46cbdba5fc9b038638ecc6d5f230b50291744329198270d9e101e9f14",
     "width": 700,
     "height": 828,
     "role": "thumbnail",
     "derived_from": "/assets/leonardo/sketches.jpg",
     "processing": "Resized with sips; also used in the scale drawing."
    }
   ],
   "rights": {
    "public_domain": true,
    "license": "CC0 / Public Domain",
    "reusable": true,
    "credit": "The Metropolitan Museum of Art, Rogers Fund, 1917",
    "note": "Met API: isPublicDomain true (checked 2026-10-17)."
   },
   "context_source": "Museum label text on https://www.metmuseum.org/art/collection/search/337494, read 2026-10-17 in a headless browser; quoted and paraphrased with attribution."
  },
  {
   "id": "head",
   "museum": "The Metropolitan Museum of Art",
   "museum_id": 339116,
   "artist": "Leonardo da Vinci",
   "title": "Head of a Man in Profile Facing to the Left",
   "date": "1490–94",
   "medium": "Pen and brown ink, over soft black chalk",
   "dimensions": "4 5/8 x 2 1/16in. (11.7 x 5.2cm)",
   "credit_line": "Rogers Fund, 1909",
   "accession_number": "10.45.1",
   "url": "https://www.metmuseum.org/art/collection/search/339116",
   "api_source": "https://collectionapi.metmuseum.org/public/collection/v1/objects/339116",
   "is_public_domain": true,
   "images": [
    {
     "file": "/assets/leonardo/head.jpg",
     "bytes": 806911,
     "sha256": "e226de9e803bf5ed04da4820389999c272217879f9970d008255686255dcaf49",
     "width": 1300,
     "height": 2599,
     "role": "full",
     "source": "https://images.metmuseum.org/CRDImages/dp/original/DP810248.jpg",
     "source_sha256": "e226de9e803bf5ed04da4820389999c272217879f9970d008255686255dcaf49",
     "source_bytes": 806911,
     "source_pixels": "1300×2599",
     "fetched": "Sat, 17 Oct 2026 22:33:13 GMT",
     "processing": "Unaltered copy of the Met’s image."
    },
    {
     "file": "/assets/leonardo/head-t.jpg",
     "bytes": 117014,
     "sha256": "00f6d301d8ede00d58e36bd10eede8f2e98bbf6409ac0b2fb2d3fd910ab767ca",
     "width": 420,
     "height": 839,
     "role": "thumbnail",
     "derived_from": "/assets/leonardo/head.jpg",
     "processing": "Resized with sips; also used in the scale drawing."
    }
   ],
   "rights": {
    "public_domain": true,
    "license": "CC0 / Public Domain",
    "reusable": true,
    "credit": "The Metropolitan Museum of Art, Rogers Fund, 1909",
    "note": "Met API: isPublicDomain true (checked 2026-10-17)."
   },
   "context_source": "Museum label text on https://www.metmuseum.org/art/collection/search/339116, read 2026-10-17 in a headless browser; quoted and paraphrased with attribution."
  },
  {
   "id": "lizard",
   "museum": "The Metropolitan Museum of Art",
   "museum_id": 339130,
   "artist": "Leonardo da Vinci",
   "title": "Allegory on the Fidelity of the Lizard (recto); Design for a Stage Setting (verso)",
   "date": "1496",
   "medium": "Pen and brown ink (recto and verso)",
   "dimensions": "7 15/16 x 5 1/4in. (20.2 x 13.3cm)",
   "credit_line": "Rogers Fund, 1917",
   "accession_number": "17.142.2",
   "url": "https://www.metmuseum.org/art/collection/search/339130",
   "api_source": "https://collectionapi.metmuseum.org/public/collection/v1/objects/339130",
   "is_public_domain": true,
   "images": [
    {
     "file": "/assets/leonardo/lizard.jpg",
     "bytes": 1116715,
     "sha256": "9221d650b7629d43531c7f0438d9b605bb949a4cf62cae4a882d60208153c868",
     "width": 1600,
     "height": 2360,
     "role": "full",
     "source": "https://images.metmuseum.org/CRDImages/dp/original/DT232678.jpg",
     "source_sha256": "0b882c8af9e3960e28ebe4577bc5df5aeed7b32b664b05f5772bbd4accf69803",
     "source_bytes": 1891048,
     "source_pixels": "2523×3722",
     "fetched": "Sat, 17 Oct 2026 22:33:13 GMT",
     "processing": "Resized from the Met’s 2523×3722 image to 1600 px wide with macOS sips (JPEG quality 86). No crop, no colour change."
    },
    {
     "file": "/assets/leonardo/lizard-t.jpg",
     "bytes": 168413,
     "sha256": "12fa89b64100c6485b045300eb9091b3fe3a26a5832eef233026b3455e78e5c2",
     "width": 700,
     "height": 1032,
     "role": "thumbnail",
     "derived_from": "/assets/leonardo/lizard.jpg",
     "processing": "Resized with sips; also used in the scale drawing."
    }
   ],
   "rights": {
    "public_domain": true,
    "license": "CC0 / Public Domain",
    "reusable": true,
    "credit": "The Metropolitan Museum of Art, Rogers Fund, 1917",
    "note": "Met API: isPublicDomain true (checked 2026-10-17)."
   },
   "context_source": "Museum label text on https://www.metmuseum.org/art/collection/search/339130, read 2026-10-17 in a headless browser; quoted and paraphrased with attribution."
  },
  {
   "id": "lizard-verso",
   "museum": "The Metropolitan Museum of Art",
   "museum_id": 339130,
   "artist": "Leonardo da Vinci",
   "title": "Allegory on the Fidelity of the Lizard (recto); Design for a Stage Setting (verso) — verso",
   "date": "1496",
   "medium": "Pen and brown ink (recto and verso)",
   "dimensions": "7 15/16 x 5 1/4in. (20.2 x 13.3cm)",
   "credit_line": "Rogers Fund, 1917",
   "accession_number": "17.142.2",
   "url": "https://www.metmuseum.org/art/collection/search/339130",
   "api_source": "https://collectionapi.metmuseum.org/public/collection/v1/objects/339130",
   "is_public_domain": true,
   "images": [
    {
     "file": "/assets/leonardo/lizard-verso.jpg",
     "bytes": 857059,
     "sha256": "5a31d1ff5de192711a198778cc536eafd05d8ce6f1fe1fffc0507bef56048a50",
     "width": 2000,
     "height": 1366,
     "role": "full",
     "source": "https://images.metmuseum.org/CRDImages/dp/original/DT339729.jpg",
     "source_sha256": "52853675ece3191342125a8be31a8359d5da2459f0c605ba34731b773e00663a",
     "source_bytes": 2144238,
     "source_pixels": "3811×2603",
     "fetched": "Sat, 17 Oct 2026 22:33:15 GMT",
     "processing": "Resized from the Met’s 3811×2603 image to 2000 px wide with macOS sips (JPEG quality 86). No crop, no colour change."
    },
    {
     "file": "/assets/leonardo/lizard-verso-t.jpg",
     "bytes": 91208,
     "sha256": "1ce01bedce26a5f87bc67051cea0eeb3394211288bb142d858cb244b07172677",
     "width": 700,
     "height": 478,
     "role": "thumbnail",
     "derived_from": "/assets/leonardo/lizard-verso.jpg",
     "processing": "Resized with sips; also used in the scale drawing."
    }
   ],
   "rights": {
    "public_domain": true,
    "license": "CC0 / Public Domain",
    "reusable": true,
    "credit": "The Metropolitan Museum of Art, Rogers Fund, 1917",
    "note": "Met API: isPublicDomain true (checked 2026-10-17)."
   },
   "context_source": "Museum label text on https://www.metmuseum.org/art/collection/search/339130, read 2026-10-17 in a headless browser; quoted and paraphrased with attribution."
  },
  {
   "id": "grotesque",
   "museum": "The Metropolitan Museum of Art",
   "museum_id": 338125,
   "artist": "After Leonardo da Vinci",
   "title": "The Head of a Grotesque Man in Profile Facing Right",
   "date": "after 1500",
   "medium": "Pen and brown ink, on off-white paper (now darkened)",
   "dimensions": "(irregular): 3 5/8 × 2 1/8 in. (9.2 × 5.4 cm)",
   "credit_line": "Rogers Fund, 1917",
   "accession_number": "17.142.3",
   "url": "https://www.metmuseum.org/art/collection/search/338125",
   "api_source": "https://collectionapi.metmuseum.org/public/collection/v1/objects/338125",
   "is_public_domain": true,
   "images": [
    {
     "file": "/assets/leonardo/grotesque.jpg",
     "bytes": 334445,
     "sha256": "48f20b28dcef1fd08e083eede6ee2c62fe241b40459c2fe2337785760b316daf",
     "width": 1003,
     "height": 1674,
     "role": "full",
     "source": "https://images.metmuseum.org/CRDImages/dp/original/DP808305.jpg",
     "source_sha256": "48f20b28dcef1fd08e083eede6ee2c62fe241b40459c2fe2337785760b316daf",
     "source_bytes": 334445,
     "source_pixels": "1003×1674",
     "fetched": "Sat, 17 Oct 2026 22:33:16 GMT",
     "processing": "Unaltered copy of the Met’s image."
    },
    {
     "file": "/assets/leonardo/grotesque-t.jpg",
     "bytes": 89993,
     "sha256": "d8531f92a955a51eb338f1c9c779ebfac6d23ce30f9a041ae24581da5cd9d8ab",
     "width": 420,
     "height": 701,
     "role": "thumbnail",
     "derived_from": "/assets/leonardo/grotesque.jpg",
     "processing": "Resized with sips; also used in the scale drawing."
    }
   ],
   "rights": {
    "public_domain": true,
    "license": "CC0 / Public Domain",
    "reusable": true,
    "credit": "The Metropolitan Museum of Art, Rogers Fund, 1917",
    "note": "Met API: isPublicDomain true (checked 2026-10-17)."
   },
   "context_source": "Museum label text on https://www.metmuseum.org/art/collection/search/338125, read 2026-10-17 in a headless browser; quoted and paraphrased with attribution."
  },
  {
   "id": "virgin",
   "museum": "The Metropolitan Museum of Art",
   "museum_id": 337496,
   "artist": "Leonardo da Vinci",
   "title": "The Head of the Virgin in Three-Quarter View Facing Right",
   "date": "1510–13",
   "medium": "Black chalk, charcoal, and red chalk, with some traces of white chalk (?); some remains of framing lines in pen and brown ink at upper right (not by Leonardo)",
   "dimensions": "Sheet: 8 x 6 1/8 in. (20.3 x 15.6 cm)",
   "credit_line": "Harris Brisbane Dick Fund, 1951",
   "accession_number": "51.90",
   "url": "https://www.metmuseum.org/art/collection/search/337496",
   "api_source": "https://collectionapi.metmuseum.org/public/collection/v1/objects/337496",
   "is_public_domain": true,
   "images": [
    {
     "file": "/assets/leonardo/virgin.jpg",
     "bytes": 1351486,
     "sha256": "9732492ff757421ca9bf3c3630ebf6c2b0600c9987dc09827fcf05da9db71c26",
     "width": 1700,
     "height": 2186,
     "role": "full",
     "source": "https://images.metmuseum.org/CRDImages/dp/original/DP102382.jpg",
     "source_sha256": "d0bc8c66e26cbd01259df8a98d0c3291a05d07b22404b7cac35bcb40f402ecb0",
     "source_bytes": 2625212,
     "source_pixels": "2972×3822",
     "fetched": "Sat, 17 Oct 2026 22:33:17 GMT",
     "processing": "Resized from the Met’s 2972×3822 image to 1700 px wide with macOS sips (JPEG quality 86). No crop, no colour change."
    },
    {
     "file": "/assets/leonardo/virgin-t.jpg",
     "bytes": 195705,
     "sha256": "fedcc8989e0a4242f55b015cc6724e8805ef231ee846901f6e26ad4d853da90f",
     "width": 700,
     "height": 900,
     "role": "thumbnail",
     "derived_from": "/assets/leonardo/virgin.jpg",
     "processing": "Resized with sips; also used in the scale drawing."
    }
   ],
   "rights": {
    "public_domain": true,
    "license": "CC0 / Public Domain",
    "reusable": true,
    "credit": "The Metropolitan Museum of Art, Harris Brisbane Dick Fund, 1951",
    "note": "Met API: isPublicDomain true (checked 2026-10-17)."
   },
   "context_source": "Museum label text on https://www.metmuseum.org/art/collection/search/337496, read 2026-10-17 in a headless browser; quoted and paraphrased with attribution."
  },
  {
   "id": "divine-proportion",
   "museum": "The Art Institute of Chicago",
   "museum_id": 272694,
   "artist": "Leonardo da Vinci (Italian, 1452-1519); written by Luca Pacioli (Italian, 1445-1517)",
   "title": "Divine Proportion",
   "date": "Venice: Paganinus de Paganinus, 1509",
   "medium": "Letterpress and woodcut in black with hand lettering in red ink, on ivory laid paper; binding in full buckram bookcloth",
   "dimensions": "29.7 × 20.4 × 3.2 cm (11 3/4 × 8 1/16 × 1 5/16 in.)",
   "credit_line": "Gift of Mr. F.A. Wells",
   "accession_number": "2024.56",
   "url": "https://www.artic.edu/artworks/272694",
   "api_source": "https://api.artic.edu/api/v1/artworks/272694",
   "is_public_domain": true,
   "images": [
    {
     "file": "/assets/leonardo/solids-icosahedron.jpg",
     "bytes": 313290,
     "sha256": "345538f7cad73eccddc8d634c46fb288d6fca85ef2cc48f265882789162caf21",
     "width": 843,
     "height": 1228,
     "role": "full",
     "source": "https://www.artic.edu/iiif/2/7d0d6e90-b6ee-0ff1-2e0e-983ccf0c4236/pct:50,3,46,94/843,/0/default.jpg",
     "processing": "Unaltered museum IIIF region (right-hand page of the spread, plate XXIIII), captured from inside the artwork page; see tools/receipts/leonardo/artic-captures.json."
    },
    {
     "file": "/assets/leonardo/solids-icosahedron-t.jpg",
     "bytes": 102306,
     "sha256": "862980f3f222d1f029e92c428263bf73f0dfd69fa3a75792b4e1221585987751",
     "width": 560,
     "height": 815,
     "role": "thumbnail",
     "derived_from": "/assets/leonardo/solids-icosahedron.jpg",
     "processing": "Resized to 560 px wide with sips."
    },
    {
     "file": "/assets/leonardo/solids-tetrahedron.jpg",
     "bytes": 312359,
     "sha256": "a63bc8f993743d091310dc4152f2838a839a41933ebf1a184870262fe614105c",
     "width": 843,
     "height": 1224,
     "role": "full",
     "source": "https://www.artic.edu/iiif/2/5e7f5bd0-a027-547e-2ada-252ba3971411/pct:50,3,46,94/843,/0/default.jpg",
     "processing": "Unaltered museum IIIF region (right-hand page of the spread, plate VI), captured from inside the artwork page; see tools/receipts/leonardo/artic-captures.json."
    },
    {
     "file": "/assets/leonardo/solids-tetrahedron-t.jpg",
     "bytes": 106599,
     "sha256": "ed5d557321de4f99d57890fd55cf575b5aedeae08fa13f7e91b49bb58261496b",
     "width": 560,
     "height": 813,
     "role": "thumbnail",
     "derived_from": "/assets/leonardo/solids-tetrahedron.jpg",
     "processing": "Resized to 560 px wide with sips."
    }
   ],
   "rights": {
    "public_domain": true,
    "license": "CC0 / Public Domain",
    "reusable": true,
    "credit": "The Art Institute of Chicago, Gift of Mr. F.A. Wells",
    "note": "AIC API: is_public_domain true (checked 2026-10-17)."
   },
   "lettering_read_from_image": [
    "Icosaedron abscisum Vacuum (plate XXIIII)",
    "Tetraedron elevatum vacuum (plate VI)",
    "Horum inventor. Magister Lucas Paciolus de burgo Sancti Sepulchri, Ordinis Minorum (plate VI)"
   ],
   "context_source": "https://galileo.ou.edu/exhibits/divine-proportion.html (read 2026-10-17): Leonardo provided the geometrical figures; the only Leonardo material printed in his lifetime."
  }
 ]
}