Interior Design Aesthetics: 5 Principles That Turn a Mixed Pinterest Board Into One Style

October 26, 2026

My friend Callum bought a 1960s flat last spring. His Pinterest board had 140 pins. Japandi, Art Deco, mid-century, all mixed together. He couldn’t pick one. He asked me which style was his. I told him that’s the wrong question. Interior design aesthetics aren’t the same thing as styles. An aesthetic is the overall look and feel. A style is one named version of it. Five design principles decide whether any mix holds together. I’ll cover each one below. Then I’ll show how a few famous styles use them, and how Callum finally settled on a look he liked.

What Are Interior Design Aesthetics, and How Do They Differ From Styles?

Callum’s board looked chaotic. When I scrolled it, though, I noticed something. Almost every pin felt calm and warm. That was his aesthetic. It was the mood running under the labels. A style is more specific. It has a name, a history, and a set of recognizable features. Two different styles can share one aesthetic. Callum’s Japandi pins and his Art Deco pins both felt ordered and quiet. He just hadn’t seen it. I hadn’t either until I stopped reading the captions. Once he named the mood, the choices got smaller. That alone cut his board in half.

Is an Aesthetic the Same as a Style?

No. An aesthetic is the overall mood and visual language of a space. A style is a named category with a history behind it. Art Deco is a good example. It took its name from the 1925 Paris exhibition, the Exposition Internationale des Arts Décoratifs et Industriels Modernes. Bauhaus is another. The German school of art, design, and architecture was founded in 1919. Callum liked both. They share a love of order, which is the aesthetic he’d been circling.

Can You Mix Several Styles in One Room?

Yes, if one principle ties them together. Usually that’s a shared color palette or a repeated material. Callum’s mix worked because of warm wood. It showed up in his Japandi shelf and again in his Deco-style sideboard. I’d say shared wood did more than any rule I could give him.

How Do the Five Principles of Design Shape Any Aesthetic?

Design teachers split the topic in two. The elements are the building blocks. They include space, line, form, texture, and color. The principles are how you arrange those blocks. Sources disagree on the exact list. Some add contrast and detail. I use the five most common, because they cover what I see going wrong in real rooms. Callum tested each one on his own living room. He’d photograph a corner, then tell me what felt off. His eye improved fast. He said it felt like learning to hear a wrong note.

What Is Balance in Interior Design?

Balance is the feeling of visual equilibrium in a room. It can be symmetrical, asymmetrical, or radial. Callum’s sideboard sat on one wall with nothing opposite it. The room tilted. He hung a large mirror across from it. The tilt went away. That was asymmetrical balance, and he didn’t need a matching piece.

How Do Rhythm and Emphasis Work?

Rhythm moves your eye around a room. It comes from repetition, progression, transition, or contrast. Emphasis creates a focal point. Callum repeated brass on his lamp and again on his cabinet pulls. His eye started traveling between them. The sideboard wall became his focal point. He cleared everything else off it.

What Do Scale and Proportion Mean?

Scale compares an object to the room and to people. Proportion compares the parts of a room to each other. Callum’s ceilings ran a bit low. A tall Deco cabinet he loved felt heavy next to them. He swapped it for a long, low one. I’d call that the biggest single change in the room.

How Do Famous Styles Use These Principles?

Think of a style as a recipe. It picks a handful of principles and turns them up. Art Deco leans on symmetry and strong geometry. Japandi leans on restraint and calm. Mid-century modern comes from the middle of the twentieth century, which suited Callum’s 1960s flat. It values clean lines and honest materials. Harmony, the fifth principle, ties them together. It comes from unity and variety working together. A room needs both. Callum had plenty of variety. He lacked unity until the wood and brass repeated.

What Defines Art Deco?

Art Deco rests on geometry and order, material contrast, and deliberate color. It’s disciplined and expressive at once, as one designer put it. The 1925 exhibition that named it drew about 16 million visitors, according to Selvedge magazine. Callum took one idea from it. He used symmetry on just one wall.

What Defines Japandi?

Japandi blends Japanese restraint with Scandinavian warmth. Wabi-sabi, the Japanese appreciation of imperfection, sits on one side. Hygge, the Danish idea of coziness, sits on the other. Callum loved the calm. He didn’t love how empty some Japandi rooms look. So he borrowed the wood and skipped the emptiness.

How Do You Choose One Aesthetic for Your Home?

Start small. Callum started with the room he used most. Choosing for a whole home felt impossible. Choosing for one room felt like a puzzle. He set a rule. Each new item had to repeat something already there, like a material or a color. That rule cut his shopping list by about half. He stopped buying things that were merely nice. I wish I’d had that rule years ago. My own flat looks like a catalog collided with a charity shop.

Where Should You Start?

Start with a couple of words that describe how you want the room to feel. Callum picked “calm and warm.” Then check each piece against those words. He rejected a bright blue lamp in about five seconds. It was a beautiful lamp. It just wasn’t calm.

Should You Hire a Designer?

Hire one if the budget is large or the project is structural. In the US, ask whether the designer holds NCIDQ certification. CIDA accredits many interior design programs. Licensing rules vary by state, so check locally. Callum didn’t hire one. He did book a single consultation, which he said was worth every penny.

Conclusion

Last Sunday Callum showed me his finished living room. The mirror hung opposite the sideboard. Brass repeated on the lamp and the cabinet pulls. He’d cut the board from 140 pins to eleven. I asked which style he’d landed on. He shrugged and said calm and warm. Interior design aesthetics weren’t a label for him. They were a filter. Before he bought a new lamp that week, he held it up and asked whether it fit the room. It took him about five minutes to decide. He left it in the shop.

FAQs

What is the difference between an aesthetic and a style?
An aesthetic is the overall mood of a space. A style is a named category with its own history and features. Callum found that two different styles can share one aesthetic.

What are the main principles of interior design?
The most common list is balance, rhythm, emphasis, scale and proportion, and harmony. Some sources add contrast and detail, so lists vary. I use the shorter one because it covers most problems I see.

Can I mix different design styles in one room?
Yes, if something ties them together. A shared color, material, or proportion usually does it. Callum’s warm wood connected his Japandi shelf to his Deco-style sideboard.

Do I need a designer to find my style?
No, though one can help with big budgets or structural work. In the US, look for NCIDQ certification, and check your state’s licensing rules. Callum booked one consultation and did the rest himself.

Leave a Comment

Contact The HomeTrotters

Have questions about home design, improvement, or collaboration?
We're here to help.

Visit Our Contact Page →