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Illusions en gris mineur

Posted February 12, 2011 by Yves Roumazeilles

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Shady optical illusion

Posted November 6, 2010 by Yves Roumazeilles

Are both greys the same?

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A circle, a spiral, something else?

Posted September 4, 2010 by Yves Roumazeilles

Square circles

Posted December 12, 2009 by Yves Roumazeilles