Feel captivities firm grip smother out the fun,
The stretch of its reach felt with each pass of the sun;
Metal doors slam shut, rumbling its echo down the hall,
Now come jail bar shadows to lurk upon the night wall;
There would come death to silence but for the jailers' keys,
To rattle the quite where freedom none sees;
Moment by moment goes time so deep to know,
Where the inuring gloom of imprisonment, time creeps so very slow;
Tony Avila Sampson
http://www.poemhunter.com/poem/imprisonment/