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Rods insensitivity to colour and poor resolution means that corner of the eye phenomena are typically black and white and their shapes vague. If you turn to look at an object seen in the 'corner of your eye', you will start to see it in much greater detail and in colour. As a consequence, it will look completely different. What was a vague dark shadow in the corner of your eye will turn into a differently shaped object in full colour. Sometimes the difference will be so pronounced that the original object will appear to vanish!