Optical Illusion

Thanks for your feedback on this great post! Auditory Illusions

If you have not eared it you’ve missed a lot.

To date this was the best optical illusion sent in. Enjoy !

Which way is this lady spinning?

 Spinning Dancer

(this woman spins at a heck of a pace on this website, have a look at the source page at the bottom of this post if you cannot get her to spin your way)

Well the answer is…

If the foot touching the ground is perceived to be the left foot, the dancer appears to be spinning clockwise (if seen from above); if it is taken to be the right foot, then she appears to be spinning counterclockwise.

The Spinning Dancer, also known as the silhouette illusion, is a kinetic, bistable optical illusion resembling a pirouetting female dancer. The illusion, created by web designer Nobuyuki Kayahara,[1][2] involves the apparent direction of motion of the figure. Some observers initially see the figure as spinning clockwise and some counterclockwise.

The illusion derives from the lack of visual cues for depth. For instance, her arms could be swinging either in front of her to the left or behind her to the left, and hence with her circling clockwise or counter-clockwise on either her left or right foot. She changes leg because she’s facing either towards or away from us, there being no surface features on the silhouette to indicate at any point which side of her is presented: the least ambiguous positions are her profiles when she’s on either side of her circle, though it’s still not known whether the foreground or background leg is on the floor, and from where she moves indeterminately either on the near or far arc across to the other profile.

Source: http://en.wikipedia.org/wiki/The_Spinning_Dancer

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