This is driving me INSANE!
I first saw this on eMusings and was intrigued, yet when I shared it with Whitey it baffled me even moreso. He cannot see the girl change directions. Ever. Never. Even when I try to help him by saying out loud “Heel, Toe, Heel, Toe” to train his eye to see it differently.
Can you see her change directions? Which way does she spin for you? Stare at her shadow — does she change direction for you?