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Keywords: Illusion 5 edited.jpg en The original image plus two stripes By joining the squares marked A and B with two vertical stripes of the same shade of gray it becomes apparent that both squares are the same 1995 http //persci mit edu/gallery/checkershadow/proof Edward H Adelson 1995 http //persci mit edu/gallery/checkershadow/download These checkershadow images may be reproduced and distributed freely CC-0 Uploaded with UploadWizard Checker shadow illusion |