If you see this lady turning clockwise, you are using your right brain.  If you see it the other way, you are using your left brain.
Some people do see both ways, but most people see it only one way.

Experimentation has shown that the two different sides, or hemispheres of
the brain are responsible for different manners of thinking.

The following table illustrates the differences between left-brain and right-brain thinking:

Left Brain                    Right Brain

Logical                         Random
Sequential                    Intuitive
Rational                        Holistic
Analytical                      Synthesizing
Objective                      Subjective 
Looks at parts               Looks at wholes

Most individuals have a distinct preference for one of these styles of thinking.  Some, however, are more whole-brained and equally adept at both modes.  In general, schools tend to favor left-brain modes of thinking, while downplaying the right-brain activities.  Left-brain scholastic subjects focus on logical thinking, analysis, and accuracy.  Right-brained subjects, on the other hand, focus on aesthetics, feeling, and creativity.
 
If you look away, she may switch from one direction to the other.