Those programs, though, frequently offer world-renowned artists. (And with classical music, you don't expect much movement, anyway.) At the WiredArts Fest, with its new, unusual, or low-budget work, and without big stars, the speed does help keep your eye engaged, especially for dance.

WSJ: Culture City: The Arts Festival You Can Watch on Your Couch

Your brain triangulates these signals to keep you balanced, and to move your eyes at exactly the same speed (and exactly opposite direction) as your head so the world doesn't look like it's being filmed by an amateur.

FORBES: Magazine Article

He is following a simple rule: Keep the angle of the falling ball constant in your vision and adjust your running speed accordingly.

WSJ: Matt Ridley on Gut Feelings and the Writings of Gerd Gigerenzer | Mind & Matter