Seeing (Gaze Tracking) is beyond mouse/tap pointing

Gaze tracking is beyond mouse/taop poiting in two senses.
1. Seeing is followed by muscle motors, i.e., finger pointing operations in the current human computer interaction. Seeing is a direct expression of pointing. Seeing is a far responsive pointer than the current finger based methods.
2. Seeing is 3D. Pointing in the current human computer interaction is mere 2D. Current computer has not evolved into 3D user experiences, it is easy to imagine future human machine/robot interaction is 3D. Imagine an autofocus camera captures what human is seeing in the world.

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