But illness does not always write itself upon the body, the sickness I search for is hidden deep within the brain. Sometimes it rises to the surface. Sometimes the face betrays what the body conceals. But these moments, these betrayals, last no longer than an instant. They come, they go, they pass over the patient, darkening and brightening his face like clouds gusting over a meadow.
― Sarah Shun-lien Bynum, Madeleine Is Sleeping