SPINNING DANCER OPTICAL ILLUSION

Spinning Dancer Optical Illusion
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SPINNING DANCER OPTICAL ILLUSION



Written by Meadows Hulme
21 Thursday 21st November 2013

On Monday I was mindnumbingly browsing the internet, looking for something to post on here that would be intersting for you all to read about. After a while of seeing puppies hanging around with chickens and something which I hate, 'complete fails,' I stumbled across an old fave of mine. The Spinning Dancer optical illusion, it blows my mind every time I see it. 

I am going to use Wikipedia now to explain it all to you:

The Spinning Dancer is a kinetic, bistable optical illusion resembling a pirouetting female dancer. The illusion, created in 2003 by web designer Nobuyuki Kayahara, it involves the apparent direction of motion of the figure. Some observers initially see the figure as spinning clockwise (viewed from above) and some anti-clockwise. Additionally, some may see the figure suddenly spin in the opposite direction.

The illusion derives from the lack of visual cues for depth. For instance, as the dancer's arms move from viewer's left to right, it is possible to view her arms passing between her body and the viewer (that is, in the foreground of the picture, in which case she would be circling anti-clockwise on her right foot) and it is also possible to view her arms as passing behind the dancer's body (that is, in the background of the picture, in which case she is seen circling clockwise on her left foot).

When she is facing to the left or to the right, her breasts and ponytail clearly define the direction she is facing, although there is ambiguity in which leg is which. However, as she moves away from facing to the left (or from facing to the right), the dancer can be seen (by different viewers, not by a single individual) facing in either of two directions. At first, these two directions are fairly close to each other (both left, say, but one facing slightly forward, the other facing slightly backward) but they become further and further away from each other until we reach a position where her ponytail and breasts are in line with the viewer (so that neither her breasts nor her ponytail are seen so readily). In this position, she could be facing either away from the viewer or towards the viewer, so that the two positions two different viewers could see are 180 degrees apart.

Well here you go, check it out:

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