I am a big fan of optical illusions; I love 'em (see here and here and here and here). A lot of Bad Astronomy is due to one illusion or another, like the Glass Worm, but that's incidental. I just think they're cool.
One of my favorites is the in-out illusion, where your brain can't tell if something is convex or concave. It's maddening, and fun. The Mighty Optical Illusions site has one of the best examples I have ever seen of it, a spinning silhouette that'll melt your brain. Go have a look!
TODAY IN SLATE
False rape accusations exist, and they are a serious problem.
Scotland Is Just the Beginning. Expect More Political Earthquakes in Europe.
No, New York Times, Shonda Rhimes Is Not an “Angry Black Woman”
The Music Industry Is Ignoring Some of the Best Black Women Singing R&B
How Will You Carry Around Your Huge New iPhone? Apple Pants!
The Most Terrifying Thing About Ebola
The disease threatens humanity by preying on humanity.
The Other Huxtable Effect
Thirty years ago, The Cosby Show gave us one of TV’s great feminists.