the institute acts as a globalising force upon the inmates. its affect r seen wen brookes kills himself wen he is separated from that, this would show the difference between the global world. then u can argue the fact that the world outside has changed due to the global affects. then again he is retreating from the globalised world.
then the major retreat is when in the end he escapes from that global culture into his local, in Wah-santaeneto, the place in mexico.
then u can include the aspects of global and local u see in different place, eg- the forceful homogenising of the prisoners(like at the start when they come in, they are all forced to do wat they r told, their identities r lost.), similarly the local seen at the end with the change in him wid the relaxed clothing and sense of freedom.