desertwind
Cyborg Agent
Explanation
In shadow or not, a check that is lighter than its neighboring checks is probably lighter than average, and vice versa. In the figure, the light check in shadow is surrounded by darker checks. Thus, even though the check is physically dark, it is light when compared to its neighbors. The dark checks outside the shadow, conversely, are surrounded by lighter checks, so they look dark by comparison.
Read Full explanation here
Proof
*web.mit.edu/persci/people/adelson/images/checkershadow/checkershadow_double_med.jpg
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.
Get Proof here
In shadow or not, a check that is lighter than its neighboring checks is probably lighter than average, and vice versa. In the figure, the light check in shadow is surrounded by darker checks. Thus, even though the check is physically dark, it is light when compared to its neighbors. The dark checks outside the shadow, conversely, are surrounded by lighter checks, so they look dark by comparison.
Read Full explanation here
Proof
*web.mit.edu/persci/people/adelson/images/checkershadow/checkershadow_double_med.jpg
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.
Get Proof here
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