Shiny ball, where's her head? - an optical illusion

What is it, and where?

This award-winning photo by Paul Hanna is of Spain's Carolina Rodriguez performing at the World Rhythmic Gymnastics Championship in Madrid, October 2001. 

Strangely, even after I figured out what was going on with her body, I thought she was a figure skater.

Paul Hanna Reuters / Sports Illustrated, Pictures of the Year International>>