"Leah has been living with akinetopsia, or motion blindness, since she was a child. For the last twenty years, she hasn't been able to see movement. As she walks around her upper Manhattan neighborhood with her white stick tapping in front, most people assume she's blind. But the truth is Leah sees a good deal, and with her acute senses of smell and hearing, very little escapes her notice. She has a quiet, orderly life, with little human contact beyond...