The title of this post might seem odd coming from a guy who helps run a site on Visual Regression Testing (and has given many talks on the subject)...
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The mouth on the right is bigger.
They're different pictures. I can tell because of the pixels.
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Nice article
if you cross your eyes until both images overlap and then let the composite image come into focus, the difference will shimmer a bit
Dead on - the mouth on the space ship was shimmering for me.