Butterflies
The folks over at Optical Spy created this really nice motion illusion called Butterflies. The square in the center of this image appears to be completely unstable as it appears to wobble around.
To see an illusion with a similar effect, take a look at the Moving Mona Lisa Face.
(via Optical Spy)
(2 votes)
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Nice — but sad that, as so often, the original is not attributed: It’s by A. Kitaoka, who called it “Spine Drift Illusion”.
See here
http://michaelbach.de/ot/mot-spineDrift/
for a little background and explanation.
Excellent background information Michael. Thanks for sharing.
My apologies for not attributing the excellent original, I am a little new to this. It has now been rectified.
http://www.opticalspy.com/opticals/butterflies