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blue

vr.tr.blue · thing-q1088

Let an agent specify blue precisely and handle its meanings in signalling and design, and its accessibility.

Thing Registry Cross-cutting context XCT.QLT
Bundle → Layer → Finding → QuestionsClassifiersWhat it isWhy it existsDistinguishing featuresWhat robots and AI may and may not doMoral aspectsOwnersLinks to other meta-modelsIdentity and identifiersDirect propertiesRecognitionCapabilities and actionsHazards and failure modesStandards and interfacesContext of useSources

Bundle → Layer → Finding → Questions Filled

4 bundles · 8 layers · 8 findings · 16 questions

Specification Which blue.

Value

Colour values.

Value

Exact value.

  1. Which exact blue is meant, in which colour space? measurement
  2. Which named shade is closest? definition

Standard

Safety blue.

Standard

Standardised blue.

  1. Does a standard define this blue? provenance
  2. What tolerance applies? measurement
Signalling Blue as a signal.

Meaning

Mandatory signs.

Meaning

Meaning in context.

  1. What does blue mean in this sign system? definition
  2. Is a pictogram used too? boundary

Lights

Emergency lights.

Lights

Blue lights.

  1. Which vehicles may use blue lights here? boundary
  2. What must drivers do? action
Accessibility Contrast.

Contrast

Ratio.

Contrast

Contrast ratio.

  1. What is the contrast ratio with its background? measurement
  2. Does it meet WCAG? boundary

Colour vision

Tritan.

Colour vision

Colour-vision check.

  1. How does it appear with blue-yellow deficiency? measurement
  2. Is a redundant cue provided? action
Materials and culture Pigments and meaning.

Pigments

Sources.

Pigment

Pigment.

  1. Which pigment makes this blue? definition
  2. Is it lightfast and safe? boundary

Culture

Meanings.

Meaning

Cultural meaning.

  1. What does blue signify in the target culture? definition
  2. Is it tied to institutions or brands? boundary

Classifiers Filled

Family
Thing Registry
Category
Cross-cutting context
Entry kind
thing
Plane
XCT
Domain
XCT.QLT
Other names and narrower kinds
cyan-blue, duck-egg blue, petrol blue, azure, robin egg blue, blue-gray, dull blue, slate blue, steel blue, Bondi blue, Turkish blue, blue bell

What it is Filled

The colour between violet and cyan in the visible spectrum, around 450-495 nm, perceived as the colour of a clear sky, with shades from azure to petrol blue.

Why it exists Filled

Let an agent specify blue precisely and handle its meanings in signalling and design, and its accessibility.

Distinguishing features Filled

  • A hue between violet and cyan
  • Mandatory action colour in safety signs
  • Historically rare and costly pigments
  • Blue light has health and display considerations

What robots and AI may and may not do Filled

Must not

  • Use blue as the only cue in safety signals or interfaces without a second cue.
  • Misstate the colour of goods so that buyers are misled.
  • Misrepresent the cultural or religious meanings of blue in a community.

Only with a human decision

  • Changing colours on official safety signs or emergency lighting.

May

  • Name and specify shades of blue in standard colour systems.
  • Check that blue text or signals have enough contrast for readers.

Moral aspects Filled

  • People with colour vision deficiency can miss colour-only information.
  • Colours carry political and religious meanings in many places.

Who is affected

  • People with colour vision deficiency
  • Readers and users of interfaces

Owners Filled

Steward

Nobody owns a colour; standards bodies keep reference colour specifications.

Links to other meta-models Filled

parent

  • Q140932400 - registry parent class

related

  • color - hue
  • safety sign - mandatory
  • pigment - blue pigments
  • green and cyan - boundary hues

What else AI and robots need to interact with it Filled

Identity and identifiers required Filled

  • Vercy registry: vr.tr.blue
  • Wikidata: Q1088 (https://www.wikidata.org/wiki/Q1088)
  • RAL code: 5000 series industrial blues

Direct properties not applicable Not applicable

  • dominant wavelength: 450-495 nm

Plane XCT: no invented physical properties.

Recognition optional Filled

  • Hue angle around 200-250 degrees in HSL
  • Named shades: azure, duck-egg blue, petrol blue
  • Safety blue for mandatory signs
  • The hue of a clear sky and deep sea; shades range from cyan-blue to navy.

Capabilities and actions required Filled

  • specify it in a colour space
  • use it in signs and design
  • produce it with pigments or light
  • check contrast

Hazards and failure modes required Filled

  • Low contrast of dark blue on black
  • Blue-yellow deficiency (rare)
  • Some historical pigments are toxic

Standards and interfaces required Filled

  • ISO 3864 safety colours
  • WCAG contrast

Context of use required Filled

  • Signalling information and mandatory actions, and expressing meanings in design and culture.
  • shades: azure, navy, cobalt, petrol blue
  • pigments: ultramarine, cobalt blue, Prussian blue, YInMn blue
  • safety blue (ISO 3864)

Sources Filled

  1. Wikidata item Q1088: blue - identity and sense of the item
  2. Wikipedia: Blue - general description of the item

Open questions

  • Which reference blue should the registry use?
  • How should cultural meanings be recorded?
  • Should blue pigments be separate entries?

Machine files

Card as JSON Specification Card backlog vercy.card/1

Provenance

thing registry research (pass 2) · unreviewed

Built from: models/things/publications/thing-q1088/spec.json