1. A vertical focal point. The classic chimney elevates the eye.
Even contemporary applications of the feature that maintain a consistent width and depth will have this effect.
This strong vertical focal point splits the tall, white wall of the nearby home, critical to making this outdoor living space cozy and comfortable.
2. Structure and definition. The addition of a fireplace can provide structure and definition to an otherwise open pergola.
The combination of a fireplace and screenlike foliage can create a boundary that defines an outdoor living space.
In some circumstances, a stand-alone fireplace is enough to anchor a room.
3. Light and warmth. In addition to physical warmth, fireplaces add a dramatic light and a welcoming invitation to a space. In this garden, the visual warmth of the fireplace is enhanced by applying strategic lighting to the fiery leaves of the trees that flank its chimney. I would happily put on a sweater to enjoy the cozy warmth of this patio.