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Oops, cut-and-paste typo: Michael Bach's interactive version is at 
http://www.michaelbach.de/ot/sze_silhouette/index.html

At 11:09 AM 11/11/2008, you wrote:

>ISEN-ASTC-L is a service of the Association of Science-Technology Centers
>Incorporated, a worldwide network of science museums and related institutions.
>*****************************************************************************
>
>That's a well-done version of an old visual phenomenon.  To give proper 
>credit, this was designed by Nobuyuki Kayahara in 2003, and you can see 
>the original here: http://www.procreo.jp/labo/silhouette.swf   It has 
>nothing to do with right-brain / left-brain differences; somehow that 
>erroneous "explanation" got attached to this and became a viral e-mail in 2007.
>
>Some experiments you can try:
>
>(1)  Look at a mirror image of the illusion (either a software reversal, 
>or in an actual mirror).  Does the mirror image spin the same way, or 
>opposite?  Does it matter whether you use a horizontal or vertical mirror 
>image?
>(2)  Run two identical copies of the illusion side-by-side.  Do they spin, 
>and change direction, in synchrony?  What if they're mirror images?
>(3)  Look at it with a dark filter over one eye,and then the other.  Does 
>that affect the direction of spin?  (This would now be the Pulfrich 
>effect, which Eric Siegel referenced.)
>
>For more explanation, and the chance to try two more experiments, check 
>out Michael Bach's interactive version: 
>http://www.procreo.jp/labo/silhouette.swf
>
>-Richard
>
>At 05:50 AM 11/11/2008, you wrote:
>
>>ISEN-ASTC-L is a service of the Association of Science-Technology Centers
>>Incorporated, a worldwide network of science museums and related 
>>institutions.
>>*****************************************************************************
>>
>>Like the one posted a few months ago where the b&w picture suddenly
>>became color - this one has me stumped.....any answers?
>>
>>http://tinyurl.com/33va3f
>>
>>Just because it is described as a left/right brain artifact, knowing
>>that does nothing to help me understand why!
>>
>>
>>
>>
>>
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