" You keep pressing me,” he said, “to say that the attacks start with this symptom or that symptom, this phenomenon or that phenomenon, but this is not the way I experience them. It doesn’t start with one symptom, it starts as a whole. You feel the whole thing, quite tiny at first, right from the start.… It’s like glimpsing a point, a familiar point, on the horizon, and gradually getting nearer, seeing it get larger and larger; or glimpsing your destination from far off, in a plane, having it get clearer and clearer as you descend through the clouds.” “The migraine looms,” he added, “but it’s just a change of scale—everything is already there from the start.” This business of “looming,” of huge changes of "

― Oliver Sacks , Migraine