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     When I was at boarding school, sent away during the war as a little boy, I had a sense of imprisonment and powerlessness, and I longed for movement and power, ease of movement and superhuman powers.  I enjoyed these briefly in dreams of flying and, in a different way, when I went horse riding in the village near school.  I loved the power and suppleness of my horse, and I can still evoke its easy and joyous movement, its warmth and sweet, hayey smell.

-Oliver Sacks,  On The Move:  A Life