tag:blogger.com,1999:blog-8606757687386980260.post2806518397608048176..comments2009-05-14T08:40:28.610-04:00Comments on Illusion Sciences: why are we surprised by only some of the things that we see?: Grouping by contrastArthur Shapironoreply@blogger.comBlogger1125tag:blogger.com,1999:blog-8606757687386980260.post-29090535784712685342009-05-13T22:02:00.000-04:002009-05-13T22:02:00.000-04:00After reading about this blog's winning entry on t...After reading about this blog's winning entry on the 'The Break of a Curve Ball', (Which was absolutely fascinating!), for neuralcorrelate.com's Best Visual Illusion of the year (2009), I decided to check out the older posts and came across "Grouping By Contrast". <br /><br />I wanted to point out that if I completely cover either row with thick cardboard, the illusion remains. In fact, if I cover up all circles except one, the illusion still remains! Without the gradient, a single circle appears to pulsate from the outer edge inwards concentrically towards the center. With the gradient, it looks somewhat like a model of the waxing/waning Moon -- appearing to move right to left.Albert Solernoreply@blogger.com