Art

In the field of interactive art, eyetracking could be used very creatively.
One image, shown on a display in high-resolution “made up” for the context, could suddenly animate itself when specific points are examined.

A Mona Lisa who refuses to break eye contact is certainly something that would surprise anyone.

A virtual symphony orchestra of eyes can react to the conductor, just as happens in real life.

A robotic sculpture could suddenly become animated when looked at carefully, and remain immobile should we choose to escape.
The possibilities are truly endless.