 What is the main theme of this story?
Illustrated by Freas Miss Abercrombie, the manual therapist patted the old man on the shoulder. Miss Abercrombie smoothed her smock down over trim hips and surveyed the other patients working at the long tables in the hospital's arts and crafts shop. Through the barred windows of the workshop, rolling green hills were seen, their tree-studded flanks making a pleasant setting for the mental institution. The crafts building was a good mile away from the main buildings of the hospital and the hills blocked the view of the austere complex of buildings that housed the main wards. She stopped behind a frowning, intense patient, rapidly shaping blobs of clay into odd-sized strips and forms. As he finished each piece, he carefully placed it into a hollow shell hemisphere of clay. The flying fingers continued to whip out the bits of shaped clay as the patient ignored the question. "You've been coming along famously and you must remember to answer when someone talks to you. I thought you said an 'atom bomb.'" That shows real creative thought. At the clay table, she carefully lifted the top half of the clay ball and stared thoughtfully at the jumbled maze of clay strips laced through the lower hemisphere. He stood there unmoving until a ward attendant came and took his arm an hour later to lead him off to the patients' mess hall. The sun set, darkness fell over the stilled hospital grounds and the ward lights winked out at nine o'clock, leaving just a single light burning in each ward office.
 Society's rejection of divergent thought
 Fear and exploitation of the mentally ill  The perilous impact of government secrets  The damaging impact of mental illness on perception  Society's rejection of divergent thought