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Hello all,

My name is James Sannino.  I'm helping develop prototypes for an upcoming brain exhibit at the Franklin Institute in Philadelphia. 
We're looking to get a device that shows the "thermal grill illusion."

I've only been able to find evidence for such a device at the Exploratorium, but I hear word there are more strewn about.
We're looking to figure out what the best interface would be from a visitor's point of view. 
If you're facility has one, I'd love to hear about it!
How your machine is designed, what you like about it, how you might have improved it, that sort of thing...


Thanks!
James
The Franklin Institute
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