There is something amiss with Jessie the yodeling cowgirl. The right eyelid of the "Toy Story" character is being dragged up and down — while her left eye is shooting out to the left.

This bizarre facial contortion is courtesy of one gleeful 5-year-old, aka my daughter, pressing a panel of buttons that control the eyes of a large close-up animated image of Jessie's face right in front of us.

These are just a few among many interesting buttons to press at "The Science Behind Pixar," an innovative exhibition that explores the extraordinary raft of mechanics behind some of the world's best-known animation films.