lithophane
Enable an AI agent to recognise a lithophane, assess how its relief produces a transmitted-light image, and decide how it may be fabricated, displayed, reproduced or conserved.
Bundle → Layer → Finding → Questions Filled
6 bundles · 11 layers · 15 findings · 25 questions
Medium boundary and image identity Establishes what makes the candidate a lithophane and which image-bearing entity is being described.
Transmission-based recognition
Tests the contribution of relief thickness to the visible image.
Thickness-encoded image
Record evidence that the candidate's thickness field produces its transmitted-light tonal pattern.
- Does comparison under reflected and transmitted light show that thickness variation contributes to the intended image? definition
- If pigments, coatings or embedded images are present, what part of the image is produced by thickness rather than those additions? boundary
Image, design and copy
Separates source imagery from its relief translation and physical instances.
Relief version lineage
Record how the image source, relief design and physical example are related, including meaningful revisions.
- Which source image or composition was translated into this relief, and what evidence supports that relationship? provenance
- Does a difference between two examples represent a revised relief, a production variation or alteration of an individual item? boundary
Relief-to-light response Connects material thickness and image detail to the transmitted image.
Thickness and tonal range
Characterises the thickness range and its effect on transmission.
Material-specific tonal response
Record measured or explicitly unverified relationships between thickness and transmitted brightness.
- What are the thinnest and thickest image-bearing regions, and how were they measured? measurement
- Under fixed illumination, what transmission values correspond to representative thicknesses of this material and surface finish? measurement
Image-to-relief translation
Records how tonal and spatial features of the image become relief geometry.
Tone mapping and detail retention
Identify conversion choices that affect contrast, orientation and recognisable detail.
- What mapping, sculpting method or other documented process assigned image tones to relief depths? provenance
- Which image details are lost, merged or reversed when the realised lithophane is compared with its intended image? measurement
Fabrication and relief fidelity Records how the translucent relief was produced and where production changed its intended behaviour.
Production route
Identifies the material and processes used to realise the thickness field.
Material and process evidence
Distinguish documented fabrication history from attribution based only on appearance.
- What evidence identifies the substrate and whether the relief was moulded, carved, printed or produced by another process? provenance
- Which forming, firing, curing or finishing steps are documented as changing the relief dimensions or light transmission? provenance
Realised relief quality
Assesses deviations and defects in the finished image-bearing body.
Geometry and transmission defects
Locate production features that distort image tones or weaken thin regions.
- Where do measured thickness or surface detail depart from the intended relief, if a reference design exists? measurement
- Do voids, seams, layer patterns or other observed production features create unintended bright or dark marks under transmitted light? measurement
Illumination and presentation Defines the viewing arrangement through which the lithophane becomes legible.
Backlighting field
Records the distribution and character of light reaching the lithophane.
Illumination-dependent legibility
Assess the image under documented lighting rather than assigning an unconditional quality rating.
- What light source, diffusion, spacing and ambient conditions were used when image legibility was assessed? measurement
- What lighting adjustment reduces hot spots or unreadable dark regions while remaining appropriate for the identified material? action
Viewing and mounting geometry
Connects image orientation and object form to the display arrangement.
Supported viewing configuration
Record the intended viewing side and support arrangement without treating the surrounding lamp or frame as part of the image design.
- Which viewing side and orientation produce the intended image, including any text or asymmetric features? definition
- How can the panel or curved body be supported without obscuring image-bearing areas or loading vulnerable thin regions? action
Preservation and reproduction Supports decisions about changes to the physical relief and reuse of its encoded image.
Optical and physical condition
Assesses condition in both ordinary and transmitted light.
Condition effects on image
Record how damage, deposits and previous repairs affect the thickness-encoded image and its support.
- Where do cracks, chips, deposits, discolouration or repairs change the image observed under comparable transmitted-light conditions? measurement
- What material and treatment evidence is needed before cleaning, repairing or remounting the affected regions? action
Image and relief reuse
Tracks attribution and permissions at the source-image and relief-design levels.
Reproduction basis
Record the evidence needed to reproduce, distribute or modify the lithophane's image and relief.
- Who is credited for the source imagery and relief translation, and what records support those attributions? provenance
- What documented rights or permissions cover the proposed use of the source image, relief design and any supplied fabrication file? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these check these first hold for the sense of lithophane this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these kinds and varieties hold for the sense of lithophane this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these real-world use hold for the sense of lithophane this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these failure modes and hazards hold for the sense of lithophane this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of lithophane this model covers, and on what evidence? provenance
Classifiers Filled
- Family
- Thing Registry
- Category
- Information and virtual systems
- Entry kind
- thing
- Plane
- INF
- Domain
- INF.MED
What it is Filled
A lithophane is a translucent relief image, traditionally made in porcelain, whose varying thickness produces tonal differences when viewed by transmitted light.
In scope
- Recognition of an image encoded through variations in translucent material thickness
- Relationships between source image, relief design, production version and individual lithophane
- Thickness-to-tone behaviour under specified illumination and viewing conditions
- Fabrication features that affect image legibility and physical integrity
- Display, reproduction and conservation decisions specific to the translucent relief
Out of scope
- Independent interpretation and cataloguing of the original photograph, drawing or depicted subject
- General chemistry and manufacture of porcelain, polymers or other substrate materials
- Complete engineering and electrical safety of lamps or illuminated display housings
- General operation and maintenance of printers, moulding equipment or kilns
- Images formed solely by printed pigments, transparent photographic layers or reflected-light relief
Why it exists Filled
Enable an AI agent to recognise a lithophane, assess how its relief produces a transmitted-light image, and decide how it may be fabricated, displayed, reproduced or conserved.
Distinguishing features Filled
- Under transmitted light, spatial variations in material thickness contribute directly to the visible image's tonal pattern.
- The image-bearing surface has a relief or thickness field; a flat transparency carrying only photographic or printed tones does not meet this test.
- Recognition of the intended image depends substantially on transmitted light, distinguishing it from relief intended principally for reflected-light viewing.
- The material transmits enough light to reveal thickness-dependent tonal differences; an opaque relief with similar geometry does not qualify on geometry alone.
- Porcelain construction is not used as the sole recognition test; material and fabrication method must be recorded separately from the image-forming mechanism.
What robots and AI may and may not do Filled
Must not
- Handle fragile historical porcelain lithophanes without the custodian's permission.
- Make lithophanes of a person's photograph without their consent for sale or display.
- Present a modern reproduction as an antique piece.
Only with a human decision
- Restoring, selling or lending a historical lithophane.
May
- Describe how lithophanes show images by varying thickness in transmitted light.
- Catalogue lithophanes in a collection with maker, date and condition.
Moral aspects Filled
- Historical pieces are fragile and irreplaceable once broken.
- Turning private photographs into display objects can intrude on the people shown.
Who is affected
- Collectors and museums
- People whose images are used
Owners Filled
Steward
The person or institution that owns each piece.
Links to other meta-models Filled
parent
- Q4502142 - registry parent class
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.lithophane
- Wikidata: Q623020 (https://www.wikidata.org/wiki/Q623020)
Direct properties not applicable Not applicable
- Image and relief identity: source image ↔ relief design ↔ production version ↔ physical item
- Image-forming mechanism: thickness-controlled transmission; hybrid thickness and colour; unresolved
- Translucent substrate: identified material, colour, surface treatment and identification confidence
- Image-bearing thickness range: minimum and maximum thickness in mm, with measurement method
- Thickness-to-transmission response: transmitted-light fraction or percentage at measured thicknesses under stated conditions
- Relief feature resolution: smallest resolved lateral feature in mm under a stated fabrication or inspection method
- Display geometry: flat panel; curved panel; cylindrical form; other documented form
- Illumination arrangement: light source, diffuser, source-to-object distance, illuminated side and ambient conditions
- Transmitted-image condition: legible; reduced contrast; local light leakage; obscured detail; unassessed, with observations
- Relief integrity: intact; cracked; chipped; warped; repaired; otherwise altered, with locations
Plane INF: no invented physical properties.
Recognition optional Filled
- A thin translucent porcelain panel carries shallow relief that can appear indistinct under front lighting.
- Backlighting reveals a tonal image in which thinner regions appear lighter and thicker regions appear darker.
- The image follows variations in material thickness rather than depending solely on painted surface shading.
Capabilities and actions required Filled
- Check whether a candidate produces an image through thickness-controlled transmission.
- Trace a physical example to its relief design, source imagery and documented production history.
- Evaluate a proposed relief against measured material transmission and fabrication limits.
- Compare image legibility under alternative backlighting and viewing arrangements.
- Identify thin areas, mounts, repairs or contamination that threaten integrity or distort the image.
- Determine whether a proposed reproduction or display has sufficient technical evidence and documented rights.
Hazards and failure modes required Filled
- Thin porcelain can fracture under impact or bending, leaving sharp fragments that can injure people or damage nearby objects.
- Heat and uneven heating from an unsuitable light source can crack the panel or degrade its mounting materials.
- Insecure mounting can allow the panel to fall and injure people or damage property.
Standards and interfaces not applicable Not applicable
Not applicable
No standard or official classification specific to a standalone porcelain lithophane is identified with confidence.
Context of use required Filled
- Lithophanes are displayed in windows, lampshades and illuminated panels so transmitted light reveals their images.
- They are encountered as decorative objects, commemorative portraits and museum pieces whose appearance depends on both relief thickness and lighting.
Sources Filled
- Wikidata item Q623020: lithophane - identity and sense of the item
- Wikipedia: Lithophane - general description of the item
Open questions
- Which authoritative terminology establishes the boundary of lithophane for non-porcelain examples and hybrids that combine relief transmission with colour imagery?
- Does an existing Vercy world model already own this concept or its thickness-encoded image mechanism, requiring linkage instead of a separate publication?
- Which repeatable measurement method best separates substrate transmission, illumination unevenness and relief geometry when assessing image quality?
- What evidence should distinguish a new relief expression from a fabrication variant when the source image is unchanged but thickness mapping or curvature changes?
- Which material-specific conservation guidance establishes suitable illumination, mounting and treatment limits for the particular lithophane being recorded?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q623020/spec.json