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Blue green spiral illusion
You see embedded spirals, right, of green, pinkish-orang ...

Optical illusion: The blue and the green.
http://www.slate.com/blogs/bad_astronomy/2009/06/24/the_blue_and_the_green.html

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Blue green spiral illusion

You see embedded spirals, right, of green, pinkish-orange, and blue? Incredibly, the green and the blue spirals are the same color. At first I thought Richard was pulling our collective legs, being a trickster of high magnitude. So I loaded the image in Photoshop and examined the two spirals. In the two squares displayed below, the one on the left is colored using the same color from the blue spiral, and on the right using the green spiral.

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<div class="text parbase section"><center><table><tbody><tr><td align="center"><a href="http://www.buzzhunt.co.uk/2009/06/22/green-and-blue/" target="_blank"><img src="http://blogs.discovermagazine.com/badastronomy/files/2009/06/colors.gif" alt="Blue green spiral illusion"></a></td></tr></tbody></table></center><br clear="all"><p></p> </div> <div class="text parbase section"> <p>You see embedded spirals, right, of green, pinkish-orange, and blue? Incredibly, the green and the blue spirals <em>are the same color</em>. At first I thought Richard was pulling our collective legs, being a trickster of high magnitude. So I loaded the image in Photoshop and examined the two spirals. In the two squares displayed below, the one on the left is colored using the same color from the blue spiral, and on the right using the green spiral.</p></div>