If you walk while carrying a cup of liquid, you are more likely to spill the liquid -- if you watch the surface; than if you just walk and carry the cup without watching the surface of the liquid.
Do an experiment yourself. Fill a cup with liquid and then try and carry it to a destination that is a good distance away. First, just walk. Second return to the starting point and conscientiously watch the surface of the liquid, while you walk. Don't actually "try" to do anything just walk and constantly monitor the surface of the liquid with your eyesight.
Most likely, you will be unable to carry the liquid without spilling if you watch the liquid surface while you walk.
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Recently, I found that I can tie a tie more accurately, with better length if I do not look in a mirror while I am tying the tie. If I just stand there and tie the necktie, and then check it, it is more likely to be the correct length front and back.
Sometimes things work out better when we don't pay as much attention...
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copyright(c)2015
William Schaeffer
The same principle applies to photography and video. If you look directly at the camera display, or cell phone display -- your hand will be more unstable. If you look through the scene to the subject and beyond, trusting the frame to take care of itself, you will have a more stable shot.
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