Eye-hand coordination: adding complexity

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We humans can reach out and grasp objects with amazing accuracy. If you need something, like a cup of coffee, it is usually a simple matter to look where you remember leaving it, reach out and pick it up. But think about how complicated that process actually is and how remarkably well you do it. When you reach out to pick up the cup of coffee, not only do you direct your arm towards the cup, the posture of your hand and fingers anticipates the size, shape and orientation of the cup well before contact is made. One of the things that make this possible is your keen sense of vision.