Originally published at: Have you ever seen the Pigeon Neck illusion? | Boing Boing
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Less ‘pigeon neck’ illusion and more ‘shake a tail feather’ illusion.
It looks like it’s the way the stripes come off the back of the bird that creates the effect.
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Embed on Bach’s site didn’t load for me, but the link to youtube (which I assume is the same thing) is this.
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In summary, human eyes have difficulty with low-contrast images.
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