Colour Harmonies in Architecture: Types, Principles and Applications
Colour is one of the most visible elements of architectural design. It can emphasize a façade, establish visual hierarchy, distinguish functions, alter the apparent scale of a room, strengthen a building’s relationship with its surroundings, and influence how materials and surfaces are perceived.
However, selecting colours for architecture is more complex than simply choosing colours that look attractive beside one another.
A colour that works well on a small sample may appear very different when applied to a large wall. Daylight can alter its appearance throughout the day, while artificial lighting can change it again at night. The same colour can also appear different depending on the material, texture, neighbouring colours and surrounding environment.
This is why colour harmony in architecture should be understood as a relationship between colours, surfaces, light, materials, scale and architectural intention.
What Is Colour Harmony in Architecture?
Colour harmony in architecture is the intentional relationship between two or more colours so that they work together visually within a building, interior, façade or landscape setting.
Colour harmony may be created through similarity, controlled contrast, variations in lightness, relationships between hues, or the use of neutral colours with selected accents.
Traditional colour-harmony systems provide useful starting points, but they do not guarantee a successful architectural composition. Research on colour harmony has found that there is no single universally accepted theory capable of predicting every harmonious colour combination.
In architecture, the designer must therefore consider not only which colours are combined, but also:
- Where each colour is located
- How much surface area it occupies
- The colour of adjacent surfaces
- Material and texture
- Daylight
- Artificial lighting
- Building orientation
- Viewing distance
- Function of the space
- Cultural context
- Architectural character
- User accessibility
Quick Answer: Why Is Colour Harmony Important in Architecture?
Colour harmony helps architects organize the visual appearance of buildings and spaces. It can establish hierarchy, distinguish elements, reinforce form, guide movement, create visual continuity and influence the perceived character of an environment.
A harmonious colour scheme does not necessarily mean using similar colours everywhere. Contrast can also be harmonious when it is deliberately controlled.
Understanding Colour Before Studying Colour Harmony
Before selecting a harmony, it is useful to understand the principal dimensions used to describe colour.
1. Hue
Hue refers to the basic colour family, such as:
- Red
- Yellow
- Green
- Blue
- Violet
- Orange
On a traditional colour wheel, hues are arranged according to their relationships.
2. Lightness or Value
Lightness describes how light or dark a colour appears.
For example:
- Light blue
- Medium blue
- Dark blue
Two colours may have different hues but similar lightness, or similar hues but substantially different lightness.
In architectural composition, differences in lightness are particularly important because they affect visual hierarchy and legibility.
3. Chroma or Saturation
Chroma describes the strength or intensity of a colour.
A highly chromatic colour is visually strong, while a low-chroma colour is closer to a muted or neutral appearance.
For example:
Strong blue → muted blue → grey-blue
Using highly saturated colours over large architectural surfaces can produce a very different result from using the same colours as small accents.
4. Colour and Light
Colour cannot be considered independently from illumination.
The CIE’s colourimetry standards demonstrate that colour measurement and appearance depend on defined viewing and illumination conditions. CIE standard illuminants, for example, include D65 for representative daylight and Illuminant A for typical tungsten-filament lighting.
For architectural design this means that a material sample should ideally be assessed under lighting conditions reasonably representative of the finished space.
Types of Colour Harmonies in Architecture
The colour wheel provides several traditional relationships that can be adapted to architecture.
The most useful include:
- Monochromatic
- Analogous
- Complementary
- Split-complementary
- Triadic
- Tetradic
- Neutral or achromatic
- Accented neutral
These should be treated as design frameworks rather than rigid rules.
1. Monochromatic Colour Harmony
A monochromatic scheme is based primarily on one hue with variations in lightness and chroma.
For example:
Blue → light blue → medium blue → dark blue
Architectural application
A monochromatic scheme can be useful when the architect wants to create:
- Visual continuity
- Calmness
- Material unity
- A restrained interior
- A coherent façade
- A strong identity based on one colour family
Different values can distinguish architectural elements without introducing multiple unrelated hues.
Example
A building may use:
- Pale blue walls
- Medium blue doors
- Dark blue metalwork
- Neutral flooring
The result remains within one dominant colour family.
Design lesson
Monochromatic does not mean that every surface should have exactly the same colour.
Variation in lightness, texture, reflectance and material can create richness while retaining chromatic unity.
2. Analogous Colour Harmony
Analogous colours are located close to one another on the colour wheel.
Examples include:
- Yellow + yellow-orange + orange
- Blue + blue-green + green
- Red + red-orange + orange
Analogous schemes generally create a sense of continuity because the selected hues have a close relationship.
Architectural Applications of Analogous Harmony
Analogous palettes can be useful for:
- Hospitality interiors
- Residential spaces
- Landscapes
- Educational interiors
- Cultural spaces
- Warm-toned façades
For example, an interior could combine:
Warm yellow + ochre + terracotta
The colours can be distributed across walls, flooring, furniture and architectural accents.
Important consideration
An analogous palette does not require equal quantities of all colours.
A more controlled composition may use:
Dominant colour + supporting colour + small accent
This establishes hierarchy.
3. Complementary Colour Harmony
Complementary colours are positioned opposite each other on a traditional colour wheel.
Examples include:
- Red + green
- Blue + orange
- Yellow + violet
Complementary relationships produce strong contrast.
This makes them useful when the designer wants to emphasize an architectural element.
Complementary Colour in Architecture
Complementary colours can distinguish:
- Entrance doors
- Reception desks
- Staircases
- Signage
- Feature walls
- Furniture
- Building components
- Landscape elements
For example, a predominantly blue interior could use a controlled orange accent to identify a particular functional element.
Avoid equal visual dominance
Using two highly saturated complementary colours in equal quantities across large surfaces can become visually aggressive.
A better approach is often:
Dominant neutral or muted field + controlled complementary accent
4. Split-Complementary Harmony
A split-complementary scheme uses one base colour and the two colours adjacent to its complement.
For example:
Blue + yellow-orange + red-orange
This retains contrast while generally providing more flexibility than a direct complementary pair.
Architectural application
It can be useful when an architect wants:
- A strong accent
- Multiple related colours
- Visual variety
- Controlled contrast
This scheme can work particularly well in interiors where walls, furniture and small architectural elements require differentiated colour roles.
5. Triadic Colour Harmony
A triadic harmony uses three colours distributed approximately evenly around a traditional colour wheel.
A classic example is:
Red + yellow + blue
Other triadic combinations can be generated from different starting positions.
Triadic schemes can produce strong visual energy, but architectural applications usually require careful control of:
- Area
- Saturation
- Lightness
- Material
- Hierarchy
A highly saturated three-colour palette applied equally to a building can overwhelm its architectural form.
6. Tetradic or Double-Complementary Harmony
Tetradic schemes use two complementary pairs.
A simple conceptual example is:
Blue + orange + red + green
This creates considerable colour variety.
Because of that variety, it requires stronger compositional control.
Architectural application
Tetradic schemes may be more appropriate for:
- Children’s environments
- Cultural buildings
- Creative workplaces
- Public interiors
- Exhibition environments
- Highly expressive architectural concepts
A neutral background can help prevent excessive competition among the colours.
7. Achromatic Colour Harmony
An achromatic scheme uses colours without strong chromatic hue, principally:
- White
- Black
- Grey
Architectural examples may combine:
White + light grey + charcoal
Achromatic palettes are often useful where the architect wants to emphasize:
- Form
- Shadow
- Material texture
- Geometry
- Light
- Spatial proportion
However, an achromatic environment is not automatically visually simple. Texture, reflectance, natural light and shadow can create substantial visual variation.
8. Neutral Harmony with an Accent Colour
A neutral palette may use:
- White
- Grey
- Beige
- Earth tones
with one stronger accent.
For example:
Warm grey + off-white + muted green
The accent can identify an entrance, circulation route, furniture element or feature wall.
This is particularly useful when colour needs to support architectural hierarchy without becoming the primary visual subject.
Colour Harmony Comparison
| Harmony | Basic relationship | Typical visual character | Architectural application |
|---|---|---|---|
| Monochromatic | One hue, different values/chroma | Unified | Residential, hospitality, minimal interiors |
| Analogous | Adjacent hues | Continuous | Interiors, landscape, façades |
| Complementary | Opposite hues | Strong contrast | Accents, entrances, feature elements |
| Split-complementary | Base + two neighbouring complements | Contrasting but flexible | Interiors, educational/public spaces |
| Triadic | Three broadly separated hues | Energetic | Creative/public environments |
| Tetradic | Two complementary pairs | Complex | Expressive interiors and cultural spaces |
| Achromatic | Neutrals | Restrained | Minimalist and form-focused architecture |
| Neutral + accent | Neutral field + dominant accent | Controlled emphasis | Wayfinding, entrances, interiors |
These categories are useful starting points rather than guarantees of aesthetic success.
Colour Harmony Is More Than the Colour Wheel
One of the most important lessons for architecture students is that colour-wheel geometry alone does not determine whether an architectural colour scheme works.
Research has found that colour harmony and preference can be influenced by hue difference, lightness difference, chroma difference and total colour difference.
This leads to an important architectural principle:
Do not choose architectural colours only by hue. Evaluate hue, lightness, chroma, area, material and light together.
The Role of Colour Area
The amount of surface covered by a colour can significantly affect the visual result.
A colour that works beautifully as a small accent may become overpowering when applied to an entire façade.
Research into colour harmony in interiors has specifically investigated the influence of area on perceived harmony.
Therefore, architects should evaluate colour at the approximate scale at which it will actually be experienced.
Example
A strong terracotta colour may work as:
- 5% accent
- 15% secondary element
but may produce an entirely different architectural effect when used across:
- 70% of a façade.
Colour and Architectural Form
Colour can reinforce or visually separate architectural elements.
It can be used to emphasize:
- Masses
- Voids
- Entrances
- Vertical circulation
- Structural frames
- Horizontal bands
- Recesses
- Projections
- Roof elements
- Service elements
The relationship between colour and form was particularly important in Le Corbusier’s approach to architectural polychromy.
The Fondation Le Corbusier documents how he used colour to emphasize or suppress architectural volumes and to influence the visual reading of space.
Colour Can Strengthen Architectural Hierarchy
A building rarely needs every component to have equal visual importance.
Colour can establish hierarchy.
For example:
Primary
Main building mass.
Secondary
Entrances, circulation elements or important projections.
Tertiary
Railings, furniture, signage or small details.
A palette can assign different colour strengths to each level.
This is more effective than randomly distributing several colours throughout the building.
Colour and Space Perception
Colour can influence the apparent perception of architectural space.
Designers may use differences in colour, lightness and contrast to make surfaces visually recede, advance, connect or separate.
However, these effects should not be presented as universal psychological laws. Perception depends on context, lighting, surrounding colours and individual observers.
Le Corbusier’s documented experiments provide a historical architectural example: he deliberately used colour to alter the apparent reading and hierarchy of surfaces and volumes.
Colour and Daylight
Daylight is one of the most important variables in architectural colour design.
A wall facing different orientations can experience substantially different illumination throughout the day.
Consider:
- Morning light
- Midday light
- Evening light
- Direct sunlight
- Diffuse daylight
- Reflected light
- Shadow
The same paint or finish can therefore appear different under different conditions.
The CIE’s colourimetry publications emphasize that colour measurement depends upon defined viewing and illumination conditions.
Practical design recommendation
Do not approve a major architectural colour solely from a small printed or digital sample.
Test representative material samples under the lighting conditions expected in the finished space.
Colour and Artificial Lighting
Artificial lighting also changes colour perception.
A material may appear different under:
- Warm-white lighting
- Neutral-white lighting
- Cool-white lighting
This is particularly important for:
- Hotels
- Restaurants
- Retail
- Museums
- Healthcare interiors
- Residential interiors
- Offices
The lighting design and colour palette should therefore be coordinated rather than developed independently.
Colour and Material
Colour is not simply a paint specification.
The perceived colour of an architectural surface is related to its:
- Material
- Texture
- Gloss
- Roughness
- Reflectance
- Surface pattern
- Lighting condition
- Adjacent materials
Compare:
Matte painted wall
with
Glossy ceramic tile
Even if they are intended to have a similar nominal colour, their visual behaviour can be substantially different.
Colour Harmony and Texture
Texture can modify how colour is perceived.
A rough surface may produce varied highlights and shadows, while a smooth surface may provide a more continuous field.
Architects should therefore evaluate colour together with:
Colour + Material + Texture + Light
rather than treating colour as an isolated finish.
Colour Harmony in Building Facades
For façades, colour selection should respond to the building as a whole.
Consider:
1. Building massing
Does the colour reinforce or obscure the intended massing?
2. Openings
Should windows visually merge with the façade or become a contrasting element?
3. Structural expression
Should columns, beams or frames be emphasized?
4. Entrance
Does the entrance require stronger visual emphasis?
5. Context
How does the proposed palette relate to neighbouring buildings and landscape?
6. Materials
How will stone, brick, concrete, metal, glass and coatings interact?
7. Distance
How does the palette appear from pedestrian and urban viewing distances?
Colour Harmony in Interior Architecture
Interior colour schemes should respond to the function of the space.
Residential
Often requires a balance between comfort, identity and personal preference.
Hospitality
Colour can contribute to atmosphere and brand identity.
Healthcare
Colour may support spatial differentiation and environmental legibility, but should not be treated as a universal psychological prescription.
Educational buildings
Colour can help distinguish zones and improve visual orientation.
Offices
Colour can support zoning, identity and visual hierarchy.
Retail
Colour can contribute to brand expression and guide attention.
Colour and Wayfinding
Colour can also become an organizational tool.
For example:
- Blue = Zone A
- Green = Zone B
- Orange = Zone C
However, important information should not depend on colour alone.
Accessibility guidance such as WCAG explicitly recognizes that colour differences can be insufficient by themselves for communicating information.
In architectural environments, colour coding should therefore ideally be reinforced through:
- Text
- Symbols
- Numbers
- Patterns
- Changes in material
- Lighting
- Signage
Colour Contrast and Accessibility
Colour contrast is important for visual communication.
For digital content, WCAG 2.2 specifies a minimum contrast ratio of 4.5:1 for normal text and 3:1 for large text, with specified exceptions.
These WCAG ratios are web-accessibility requirements, not a universal architectural colour standard.
Nevertheless, the underlying principle is relevant to architectural communication: important information should remain visually distinguishable for people with different visual abilities.
This is especially important for:
- Signage
- Directional information
- Room identification
- Safety information
- Maps
- Digital displays
- Public information systems
Colour in Architectural History
Colour has not always been treated as a secondary decorative layer.
Different cultures and architectural traditions have used colour in relation to:
- Symbolism
- Materials
- Religion
- Climate
- Craft
- Identity
- Ornament
- Urban character
In modern architecture, Le Corbusier provides one of the clearest documented examples of treating colour as an architectural instrument rather than merely decoration.
Le Corbusier and Architectural Polychromy
Le Corbusier developed a systematic approach to architectural colour known as Polychromie Architecturale.
The Fondation Le Corbusier documents his experiments with colour from the early twentieth century and his development of colour systems in collaboration with Salubra. The first Salubra collection appeared in 1931, with a later collection added in 1959.
His colour work demonstrates an important architectural idea:
Colour can participate in the organization of space and form.
Maison La Roche and Architectural Colour
The Maison La Roche and Maison Jeanneret in Paris were designed by Le Corbusier and Pierre Jeanneret between 1923 and 1925.
The Fondation Le Corbusier describes the rediscovered interior colours as an early experiment in the architectural polychromy that became an important part of Le Corbusier’s work.
Architectural lesson
Colour can be used to modify the reading of:
- Walls
- Volumes
- Depth
- Circulation
- Spatial sequence
rather than being applied only as surface decoration.
Pessac and Colour as a Spatial Tool
The Cité Frugès at Pessac, designed by Le Corbusier and Pierre Jeanneret, is another important reference in architectural polychromy.
The Fondation Le Corbusier identifies Pessac among the projects where Le Corbusier’s architectural polychromy is expressed.
This is particularly useful for architecture students because it demonstrates how colour can be integrated with mass, façade composition and spatial perception.
Colour Harmony and Urban Design
Colour should not always be considered at the scale of an individual building.
At the urban scale, colour relationships can occur between:
- Building façades
- Streets
- Pavements
- Landscape
- Street furniture
- Signage
- Roofs
- Public spaces
Research specifically examining colour harmony in urban environments has investigated how colour relationships affect the visual character of urban façades.
This suggests an important distinction:
A colour that works for one building may not automatically work for an entire streetscape.
A Practical Method for Selecting an Architectural Colour Harmony
Architects can use the following workflow.
Step 1 — Identify the design intention
Ask:
- What should the space communicate?
- Calmness?
- Identity?
- Energy?
- Monumentality?
- Warmth?
- Neutrality?
- Wayfinding?
Step 2 — Identify the dominant material
Start with materials that are difficult or expensive to change:
- Stone
- Brick
- Concrete
- Timber
- Metal
- Glass
Then build the colour palette around them.
Step 3 — Select a dominant colour
Choose the main visual field.
This might be:
- Off-white
- Grey
- Earth tone
- Natural material colour
- Muted hue
Step 4 — Select supporting colours
Introduce one or two supporting colours that relate to the dominant colour through:
- Hue
- Lightness
- Chroma
- Material
- Context
Step 5 — Add an accent only where necessary
Use stronger colours for elements that need emphasis.
Examples:
- Entrance
- Stair
- Reception
- Signage
- Important structural feature
Step 6 — Test the palette at scale
Evaluate large material boards or sample areas.
Do not rely exclusively on:
- Small paint chips
- Digital screens
- Renderings
Step 7 — Test under different lighting
Review:
- Daylight
- Artificial light
- Morning
- Afternoon
- Evening
Step 8 — Evaluate the surrounding context
Place the palette against:
- Landscape
- Adjacent buildings
- Street materials
- Sky
- Pavement
- Existing urban fabric
Step 9 — Check accessibility
Ensure that important information does not rely exclusively on colour.
Step 10 — Document the palette
A professional colour schedule can include:
| Element | Material | Colour | Finish | Location |
|---|---|---|---|---|
| Main wall | Paint/plaster | Selected neutral | Matte | Interior |
| Feature wall | Paint | Accent colour | Matte | Reception |
| Floor | Stone/tile | Supporting tone | Honed | Public zone |
| Door | Metal/wood | Accent | Semi-matte | Entrance |
| Ceiling | Paint | Light neutral | Matte | Interior |
The 60–30–10 Rule: Use Carefully
The commonly circulated 60–30–10 rule is often used in interior design to suggest approximate proportions for dominant, secondary and accent colours.
It can be a useful design exercise, but it should not be presented as a universal architectural standard.
Architectural projects vary significantly in:
- Scale
- Material
- Lighting
- Program
- Context
- User requirements
Therefore, use proportions as a compositional tool rather than as a mandatory formula.
Common Mistakes in Architectural Colour Selection
1. Choosing colours only from a digital screen
Screens emit light and cannot perfectly represent physical materials.
Better approach
Use physical samples whenever possible.
2. Using too many colours
More colours do not automatically create more visual richness.
Better approach
Establish a clear hierarchy.
3. Using equal quantities of strong colours
Equal quantities of highly saturated colours can create unnecessary competition.
Better approach
Establish dominant, supporting and accent roles.
4. Ignoring daylight
A palette may look different under different lighting conditions.
Better approach
Test the palette under representative lighting.
5. Ignoring materials
Paint colour cannot be separated from surface texture and reflectance.
6. Applying colour after the design is finished
Colour should be integrated with architectural composition rather than treated solely as a final decorative layer.
7. Using colour without considering context
A building should be evaluated in relation to its surroundings.
8. Treating colour psychology as a universal rule
Statements such as “blue always makes people calm” or “red always makes people energetic” are overly simplistic.
Human response to colour depends on context, culture, lighting, individual experience and the complete environment.
Colour Harmony vs Colour Contrast
These concepts should not be confused.
Colour harmony
Concerns the relationship among colours and the overall coherence of the palette.
Colour contrast
Concerns the degree of difference between colours.
A successful architectural palette can contain both.
For example:
Neutral grey + muted blue + strong orange entrance
contains both harmony and contrast.
The goal is not to eliminate contrast but to control it.
Colour Harmony, Material and Context: A Better Architectural Model
For architecture students, a useful way to think about colour selection is:
Colour = Hue + Lightness + Chroma + Area + Material + Light + Context
This is not a formal colour-science equation. It is a practical architectural design framework.
A palette should therefore be tested through several questions:
- Does the hue support the concept?
- Is the lightness hierarchy clear?
- Is the chroma appropriate for the scale?
- How much surface area does each colour occupy?
- What material carries the colour?
- How does daylight affect it?
- How does artificial lighting affect it?
- How does it relate to adjacent spaces?
- Does it support wayfinding?
- Does it remain visually legible for diverse users?
Advantages of Using Colour Harmony in Architecture
A well-considered colour strategy can:
- Strengthen architectural identity
- Establish visual hierarchy
- Support spatial organization
- Emphasize important elements
- Differentiate functional zones
- Integrate materials
- Support wayfinding
- Reinforce a design concept
- Strengthen interior atmosphere
- Contribute to urban visual coherence
These are potential design benefits, not guarantees.
Limitations and Challenges
Colour selection also involves uncertainty.
Perception varies
Different people may perceive colours differently.
Lighting changes
The same material can appear different under different lighting conditions.
Material changes appearance
Texture and reflectance affect colour perception.
Large surfaces behave differently
A colour sample may not represent its appearance on a large wall or façade.
CIE research has also documented that colour appearance can change with stimulus size, including differences in perceived lightness and chroma.
Context matters
A colour cannot be judged independently from neighbouring colours and environmental conditions.
Practical Applications of Colour Harmony
Colour harmony can be applied to:
- Residential architecture
- Commercial buildings
- Offices
- Schools
- Universities
- Healthcare facilities
- Hotels
- Restaurants
- Retail interiors
- Cultural buildings
- Religious buildings
- Industrial buildings
- Public spaces
- Streetscapes
- Landscape architecture
- Wayfinding systems
A Simple Colour-Harmony Exercise for Architecture Students
For a studio project, create three palettes for the same building.
Palette A — Monochromatic
Use one hue with different lightness values.
Palette B — Analogous
Use three neighbouring hues.
Palette C — Complementary
Use one dominant hue and a controlled complementary accent.
Then compare:
- Building massing
- Visual hierarchy
- Entrance emphasis
- Spatial character
- Material interaction
- Daylight response
- Urban context
This exercise demonstrates an important lesson:
The same architecture can communicate a different visual character simply through changes in colour relationships.
Frequently Asked Questions
What is colour harmony in architecture?
Colour harmony in architecture is the intentional organization of colours so that they create a coherent visual relationship within a building, interior, façade or surrounding environment. It considers hue relationships together with lightness, chroma, surface area, material, lighting and context.
What are the main types of colour harmony?
Common colour-harmony systems include monochromatic, analogous, complementary, split-complementary, triadic, tetradic, achromatic and neutral-with-accent schemes.
Is colour harmony the same as colour contrast?
No. Colour harmony concerns the overall relationship and coherence among colours, while contrast concerns differences between colours. A successful architectural palette can use both harmony and contrast.
Why is colour important in architecture?
Colour can help establish visual hierarchy, emphasize architectural elements, distinguish spaces, support wayfinding, reinforce identity and influence the perceived character of interiors and façades.
How does light affect architectural colour?
Light changes how colours are perceived. Daylight varies with time, weather and orientation, while artificial light sources can also alter colour appearance. Colour should therefore be evaluated under representative lighting conditions.
What is a monochromatic colour scheme?
A monochromatic colour scheme uses one primary hue with variations in lightness and/or chroma. In architecture, it can create visual unity while allowing different surfaces or elements to remain distinguishable.
What are complementary colours?
Complementary colours are positioned opposite each other on a traditional colour wheel. They create strong contrast and can be useful for architectural accents, entrances or feature elements.
Can colour change the perception of architectural space?
Colour can influence the visual reading of surfaces, depth and spatial hierarchy. Historical architectural experiments, including Le Corbusier’s work with architectural polychromy, demonstrate deliberate use of colour to modify the reading of architectural volumes.
Should architects use a fixed colour formula?
No. Colour-harmony formulas are useful starting points, but they do not automatically produce successful architectural compositions. Research indicates that colour harmony depends on multiple variables and that there is no single universally accepted predictive theory.
How should architects choose a colour palette?
Start with the architectural intention and permanent materials, then establish a dominant colour, supporting colours and accents. Test the palette at realistic scale and under representative daylight and artificial lighting before final specification.
Conclusion
Colour harmony in architecture is more than selecting colours that appear attractive together.
It is a design process involving hue, lightness, chroma, area, material, light, form, function and context.
Traditional schemes such as monochromatic, analogous, complementary and triadic harmonies provide useful starting points. However, successful architectural colour design requires the architect to go beyond the colour wheel and evaluate how colours actually behave on buildings and within spaces.
Colour can emphasize a façade, establish hierarchy, organize circulation, distinguish functions, modify the reading of architectural volumes and contribute to a building’s identity.
The most useful principle is therefore simple:
Use colour harmony as a design tool, not as a fixed formula.