Optical illusions, and “Bloody Mary” images


Take a look at this.  Focus on the “+” in the middle, and describe what you see.

Troxler Effect, the purple chaser

Troxler Effect image

No, the purple dots don’t disappear, though that’s probably what you “see.”  Worse, there’s no green dot.  Your brain sees green when the purple disappears — and even when your brain refuses to let you know the purple dots are still there, it will tell you you see a green dot when the purple dots you can’t see, disappear.

So, is it so hard to understand that people might see weird things in the mirror, if they stare at their own faces for a while?

Cortical Hemming and Hawing has the full story, with a history of the Bloody Mary story.  Go see.

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3 Responses to Optical illusions, and “Bloody Mary” images

  1. mark says:

    I see the Mother of God.

    Like

  2. Mark F. says:

    Here’s a great optical illusion involving curve balls in baseball.

    http://illusioncontest.neuralcorrelate.com/2009/the-break-of-the-curveball/

    Like

  3. rayjs says:

    What green dot? All I see is grilled cheese sandwich.

    Like

Play nice in the Bathtub -- splash no soap in anyone's eyes.

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