Hidden circles illusion

Bad Astronomy
The entire universe in blog form
Sept. 16 2009 5:08 AM

Hidden circles illusion

Hidden circles illusion

Advertisement

I'm pretty good with these things, and it took me a while to see the circles... and even when I did, they kept popping in and out of existence. Shading is critical in this particular illusion!

This illusion's been around awhile; I found a reference to it from 2007, and I imagine it's a lot older than that, too. Mnd man, it's one of the more maddening ones I've ever seen! The one above it on Richard's page made me a little woozy, too. I know men tend to be somewhat more prone to red/orange color blindness than women (I have a touch of it myself, but it's not bad), so I wonder how the genders break down in seeing that particular illusion. Go take a look and leave a comment on Richard's blog!

Phil Plait writes Slate’s Bad Astronomy blog and is an astronomer, public speaker, science evangelizer, and author of Death From the Skies!  

  Slate Plus
Slate Archives
Dec. 22 2014 3:01 PM Slate Voice: “Santa Should Not Be a White Man Anymore” Aisha Harris reads her piece on giving St. Nick a makeover.