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Spot the Difference.

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Rob Dunn at GAS has "a sure-fire way to find all the differences in 'spot the
difference' picture puzzles in a matter of seconds" as long as you can cross your eyes. First, set the pictures side by side. Then:

  1. Stare at the pictures, begin to cross your eyes.


  2. You should see a third image appear between the two pictures.


  3. Focus on the middle picture, adjusting the tilt of your head so both pictures line up exactly.


  4. Once you’ve focused on the image, all the differences should look “luminescent”.

Tell me if it works.

Image from AllStarPuzzles 


Yes - and this is the same technique used to view stereoscopic pictures. In that case the two pictures have the same elements displaced laterally, giving you the 3D effect. Try some of the examples on Wikipedia's "Stereoscopy" page.

In this case it's a total mismatch of the elements in each picture, and the "glow" is the effect of your brain trying (and failing) to place them in a 3D field of vision. Eek...
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Quicker to just open the image in Paint.NET or Photoshop Elements or whatever, copy half into another layer, set the layer transparency to 50%, and overlap the two.

I say this because things involving crossing my eyes NEVER work for me. That stupid "magic eye" craze a few years back was like torture... never in my life have I seen one of those.
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it works! even for small differences like changes in color or shading in certain areas like the line beneath the light blue circle on the upper right.
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The cross-eye thing works. And being able to do that is useful in my work (Chemistry) because sometimes journals publish stereo pairs of 3D renderings of molecules.
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James, sounds like you were trying to hard with the "magic eye" pictures. It's better to see them when you relax, rather than trying to see them. I can usually decipher them in 5-10 seconds. With those its easier NOT to cross your eyes.
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Ouch. This just made me realise how crap I am at crossing my eyes.

James... I suck at those magic eye things as well. I could stand in front of one for hours like William in Mallrats and I wouldn't see a damn thing.
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