My friend Allison just re-shared a video that we both first watched a few years ago. No matter how many times I view this, I’m struck by its haunting beauty. With angular choreography by Edouard Lock, evocative music by David Lang, and the mind-boggling speed and precision of dancers from La La La Human Steps, “Amelia” (2003) is spare, startling, and definitely deserving of more than one viewing.