This week I'm attending the annual meeting of the Vision Sciences Society in Naples Florida. Every day or so, on The Invisible Gorilla, I'll post about some of the cool, interesting, funny, or quirky (I won't say which) talks/posters I happened to catch.  I've just written about a new size illusion presented by my colleague Diane Beck and her collaborators:

"Why women wear heels: A new size illusion?" by Diane Beck, Barbara Emanuele, and Silvia Savazzi. 

Here's an example of the illusion from their poster.  Which body below looks skinnier?

Which body looks skinnier?

Find out the answer and read more about the study here.