Rilke Rainer Maria: The Panther poem as read by Robin Williams in the movie Awakenings

His vision, from the constantly passing bars,
has grown so weary that it cannot hold
anything else. It seems to him there are
a thousand bars; and behind the bars, no world.

As he paces in cramped circles, over and over,
the movement of his powerful soft strides
is like a ritual dance around a center
in which a mighty will stands paralyzed.

Only at times, the curtain of the pupils
lifts, quietly—. An image enters in,
rushes down through the tensed, arrested muscles,
plunges into the heart and is gone.