His gaze, bluntedby the unnumbered processionof iron bars, uncountedas his softly padded steps.Smooth motion of blood and sinewturning in its own, small circleprescribed by bars and walls...and skin, confined.Suddenly, without warning,a flash of light and imagepierces the caged brain,and passing through its beating heartto stillness finds its way. 
Rainer Maria Rilke
poem