| Link | Quote | Stars | Tags | Author |
| c44f1ac | It would be impossible for me to convince you that the gray square labeled A is identical in brightness to the square labeled B. | Keith Payne |
| Link | Quote | Stars | Tags | Author |
| c44f1ac | It would be impossible for me to convince you that the gray square labeled A is identical in brightness to the square labeled B. | Keith Payne |