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- Jul 8, 2010
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What’s the difference in colour between box A and box B?
Answer: None: they are both the same shade of grey (see http://www.scientificamerican.com/slideshow.cfm?id=169-best-illusions)
If you doubt it (as I did) print it out and compare
Answer: None: they are both the same shade of grey (see http://www.scientificamerican.com/slideshow.cfm?id=169-best-illusions)
If you doubt it (as I did) print it out and compare