If anyone is still confussed copy the image to a graphics program and adjust the brightness. The "eye socket" is a fold, darkening of the mandrill's fir. The optical effect is because the mandrill to the right of the photograph has it's eye level exactly at the same height as it's companion and until the image is made light enough to separate the head of the two it does seem that it is only one animal.
The details, sharpness and closeness make a wonderful and interesting photograph.
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If anyone is still confussed copy the image to a graphics program and adjust the brightness. The "eye socket" is a fold, darkening of the mandrill's fir. The optical effect is because the mandrill to the right of the photograph has it's eye level exactly at the same height as it's companion and until the image is made light enough to separate the head of the two it does seem that it is only one animal.
The details, sharpness and closeness make a wonderful and interesting photograph.
Gerald