variety

Similar to unity, a room also needs variety. By mixing certain objects, the eye is entertained by the different scales and textures. Bookcases and table accessories are great examples of variety. A designer can create variety in a kitchen by mixing open shelving with closed cabinets.

unity and harmony

Unity is created by repeating certain objects over again. A room needs to feel pulled together, and by repeating certain elements, a designer can bring harmony.

proportion and scale

There is always a fine line between good and bad proportion.

In architecture, each element needs to be proportionate to the other. Windows are some of the vital aspects to creating good proportions. The windows on the house to the left are not on the same scale as the rest of the house. While the house on the right has windows that are proportional to the rest of the house. 

On the interior of the home, accessories also need to be proportionate. The size of the objects in the image to the left balance each other out, while the accessories on the right create an uneven balance. 

Scale also is depended on other objects. The door knob on the upper image is too small for the large door, and also puts the size into proportion. The viewer is able to see how big the door is because of the door knob. The mirror down below does not look as large as it is because the wall is so large.

movement

Movement in a space is created by placing objects in an arrangement that brings the eye around the room. The flow of the room can be created by the designer to bring the eye to certain objects. Light creates a focal point that draws the eye around while size and lines can also create movement.

repetition and rhythm

Rhythm is created through the repetition of certain objects. In restaurants, the repetition of the tables and chairs bring the viewer into the space. Placing the same object in a pattern can bring the eye to various parts of a room. 

emphasis

Emphasis is created by a variety of means including paint, architecture and lighting. Colors create contrast when placed against each other. Architecture can also create contrast and therefore emphasize a specific element. In homes, even eyesores can become a focal point when placed against different architectural elements. Lighting creates emphasis by drawing the eye to a point and illuminating certain objects.

radial symmetry

The last type of symmetry is radial. Radial symmetry includes a fixed point where elements then come from. This type of symmetry is very common, but often not thought of as being symmetrical. The simplest example of radial symmetry in design is a chandelier. There is a fixed point where the lights then come from. Radial symmetry is very easy to use and keeps the eye moving.