Sandi could tell you that your balance follows your gaze. He’d stopped his mountain bike just above a trail intersection. I was waiting for him on the trail below him and to his right. Being new to the kind of pedals that held his feet captive in metal clips, he focused on getting his left foot out before he lost all of his forward momentum. Proud of his success, he turned his gaze to the right to meet mine — and his weight followed his eyes. In slow motion he keeled over down the slope toward me, still unable to free his right foot from the pedal. He tumbled unhurt into an avalanche of late-autumn leaves, branches and his own bike.