Let's consider an example.

In the scene shown the origin of world space is shown as a blue coordinate frame located under the chair. This was a convenient coordinate system for orienting the floor and walls (Notice how the axes are aligned with the floor tiles). The chair and teapot could also be easily placed and oriented in this coordinate system.

The goal of a viewing transformation is to specify the position and orientation of our 3-D graphics camera in the scene. However, its effect is almost the opposite.