Of all the birds in the frame, only one is in focus. As your eye is drawn to brighter objects over dimmer objects and shaper objects over less sharp objects your eye is naturally drawn to the sharply focused bird in the center of the frame, your eye may wander, but it will come back to this sharp object.
Learning just a little bit about how our eyes and vision work can help you make a photograph to direct the viewers eyes through the frame. It makes for better photography.
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