Interior Design Psychology: How to Change the Size of Space?

Name: Interior Design Psychology: How to Change the Size of Space?
Rating: 4.8 (25 reviews)

30 actionable tips and interior design principles based on environmental psychology

Created byAzadeh Shah

Last updated 1/2026

English

English [Auto],

What you'll learn

• Apply 30 Specific Perceptual Illusion Tips to instantly change the perceived size, depth, and height of any residential space.
• Leverage Environmental Psychology Rules concerning Proximity, Light, Symmetry, Territoriality, and Continuity to optimize well-being and visual comfort.
• Master the use of Color (including the Cool Wall Effect and Graduated Shading) to make walls visually recede and amplify light reflection
• Maximize light using different paint finishes (like high-gloss) and strategic manipulation of both natural and artificial light sources
• Use Mirrors and Glass to create the powerful optical illusion of borrowed space, simulated windows, and multiplied light.
• Select and Arrange Furniture according to psychological principles, ensuring pieces like "leggy" furniture and low-slung seating maximize visible floor and wa

Course content

5 sections • 34 lectures • 3h 3m total length

Introduction7:23
This lecture will give you a detailed overview of what will be covered in this course.
What is Environmental Psychology?4:50
A brief description of environmental psychology for understanding its rules better and use them in interior design.
Part 1: The Science of Seeing Space5:17
Understanding how the brain processes spaces perception for using it in interior design.
Part 2:Gestalt Principles in Interior Design9:39
Explaining how to use Laws of Proximity, Similarity, Continuity, Closure, Good Figure (Prägnanz), Figure-Ground, in interior design.
Part 3:The Müller-Lyer Illusion in Interiors5:18
You will Learn how lines and angles manipulate perceived length and size in interior spaces?
Tip 1: The Vertical-Horizontal Illusion5:58
You will learn how using vertical lines and horizontal lines to make a room look bigger or cozier?
Tip 2: The Principle of Least Resistance6:09
You will learn why declutter ruthlessly— is the fastest way to expand perceived space is to eliminate visual noise.
Tip 3: Clear Sightlines7:56
You will learn why to ensure an uninterrupted path from the entryway to the furthest point in the room.
Quiz 1: Science of seeing space

The Psychology of Color Receding5:02
This lecture will give you a detailed overview of what will be covered in this section.
Part 1: The Psychology of Color Receding9:43
You will learn about cool versus warm colors and their dimensional properties for using in interior design.
Tip 4: Light Neutrals as Space Expanders3:27
You will learn how to opt for whites, creams, and pale grays to reflect maximum light.
Tip 5: The "Cool Wall" Effect3:29
You will learn why you should paint the furthest wall a cool, pale color in small spaces?
Tip 6: Monochromatic Magic4:17
You will learn why we should use variations of a single, light color across walls, furniture, and textiles and make low contrast in space
Tip 7: Gloss for Depth4:13
You will learn where and why you can use semi-gloss or high-gloss paint in a house or apartment?
Tip 8: Paint the Ceiling Lighter5:17
You will learn why and which color is the best for create an ascending visual effect on the ceiling.
Tip 9: Graduated Shading4:01
You will learn how to use "dark-to-light rule" in interior design for oversizing the space perceptual?
Tip 10: Unified Trim4:04
This lecture explains why painting baseboards and crown in different color makes space looks smaller?
Tip 11: Maximize Natural Light3:50
Why you should keep window treatments sheer completely away from the window frame?
The psychology of colors

Symmetry and Order4:30
You will learn how the brain prefers balanced and predictable environments, which large, symmetrical reflections enhance, and learn How to create symmetry and Order in space.
Part 1:Mirrors as Faux Windows3:49
You will learn How to simulate additional sources of light and views with mirrors in interior design.
Tip 12 and Tip 13:Mirror Opposite the View and Floor-to-Ceiling Mirrors5:51
You will learn how to mix these tow tip to create the illusion and make a room looks bigger than it is.
Tip 14-Tip 15 and Tip 16: Mirrored Furniture ,Reflection and Transparency4:50
You will learn how to blend these 3 tip, to make space more expansive.
Mirrors and faux windows

Territoriality and Personal Space11:03
How to manipulating the volume and mass of objects within the space and using Territoriality and Personal Space rules.
Part 1:Scale and Proportion11:12
How oversized or undersized furniture pieces affect perception.
Tip 17 and Tip 18 :Choose Leggy and float Furniture2:35
Choose leggy furniture with exposed legs to reveal more floor space, and float seating slightly away from walls to create depth, breathing room, and a larger, inviting room.
Tip 19 and Tip 20: The Single Large Piece Rule+ Multi-Functional Items3:45
You will Learn how to mix using rug and furniture rule to make the room looks bigger than it is.
Tip 21 and Tip 22: High Headboards+ Wall-Mounted Storage2:37
It explain how to create an open feeling in interior design.
Tip 23 and Tip 24: Low-Slung Seating without bulky arms2:53
How to make room feel taller and expansive.
Territoriality and personal space

Continuity and Flow4:18
How seamless transitions and continuous surfaces reduce cognitive load and enhance the feeling of expansive space
Part 1 :The Uninterrupted Horizon1:53
The importance of seamless flooring and visual paths.
Tip 25 and Tip 26: Continuous Flooring+ Pattern Direction4:13
Explaining how to blur boundaries and promote flow with continues flooring and floor pattern.
Tip 27 and Tip 28: Rug and Curtains4:01
How to extend the room beyond the floor and beyond the window.
Tip 29 and Tip 30:Vertical Stacking +Transparent Doorways5:23
How to enhance the feeling of height and openness in interior design.
Concolusion11:08
Conclusion with a practical example.
Continuity and Flow

Requirements

• No prior interior design experience is required—just an interest in how your brain processes space.
• A notebook or digital device to jot down the 30 actionable tips and design concepts.
• Access to the rooms in your own home to practice the visual exercises and tricks taught in the course.

Description

Stop fighting your small spaces! This is the definitive course on transforming your home's dimensions using the hidden science of perception. You will move beyond basic decluttering and master the advanced psychological and optical illusions that professional designers use to manipulate the brain, making small rooms feel expansive, ceilings look taller, and narrow hallways appear wider.

What makes you special in the professional world, sets you apart from others, and distinguishes your architectural and interior design is using specialized professional techniques, skills, and unique scientific tricks in your work.

Taught through 30 actionable, budget-friendly tips, this course blends established environmental psychology principles with real-world design applications. Whether you live in a tiny apartment, want to boost your home’s resale value, or are a designer looking to enhance your toolkit, you will learn to visually reconstruct any room and make it feel exactly the size you need it to be.

At last You will be Master in the psychological and optical techniques and you will learn how to use them in interior design to manipulate the perceived size, height, and depth of any residential space, making small rooms feel expansive and large rooms feel cozy. Pay attention that No prior interior design experience is required for this course.

Who this course is for:

• Homeowners and Renters living in small apartments, condos, or houses who feel confined and want to maximize every square inch.
• Interior Design Students or new Professionals looking for specialized, advanced knowledge in spatial manipulation.
• Home Stagers who need fast, low-cost techniques to make properties appear larger and more valuable to potential buyers
• Anyone interested in the intersection of psychology, perception, and residential design.

Interior Design Psychology: How to Change the Size of Space?

What you'll learn

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Course content

Foundations of Environmental Psychology & Perception8 lectures • 53min

Mastering Color and Light Reflection10 lectures • 47min

Section 3: The Power of Mirrors and Reflection4 lectures • 19min

Section 4: Furniture Scale and Arrangement Tricks6 lectures • 34min

Flooring, Pattern, and Architectural Illusions6 lectures • 31min

Requirements

Description

Who this course is for: