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WAY more dramatic for me: the blue and green spirals are the same color. http://blogs.discovermagazine.com/badastronomy/2009/06/24/the-blue-and-the-green/ http:

• JoeAltmaier 17y ago
  Not really the same; the blue and green areas are mixed with other colors; its wellknown the eye sees finely mixed colors as different colors. The greyscale illusion uses quite large areas which is remarkable.
  • jamesbritt 17y ago
    "the eye sees finely mixed colors as different colors" These are hardly finely mixed. I'm 1.5 feet form my 24" monitor, looking at the thing, amazed at the illusion. I clearly see distinct stripes of color. I have to block out the bordering color with my fingers to perceive the real color.
    • JoeAltmaier 17y ago
      Still they are one tenth the dimension of the b&w illusion.