+'&title='+encodeURIComponent(document.title)+'&overview='+encodeURIComponent(document.title)+'&urllanguage=en&urlaffiliate=32003&encoding=UTF-8&urlpicture=http://www.viadeo.com/v_img14/shareit/viadeoflower.gif')
The illusion of expanding movement works best for me when I'm not looking at it directly, and when my eyes are moving, for example when I read the menus at the top of this window.
As in the Hering Illusion a few weeks ago, this is not a chart. The illusion is constructed from inserted star shapes on a workbook. But when it's at its full size in the workbook, this illusion is particularly strong, at least for me.
Here's the workbook:
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I agree, it works specifically when I am not looking at it directly.
Ankit