Could these be the paint and artwork of Doc, a character in the film Escape from Alcatraz starring Clint Eastwood?
This was only one of a number of cells with personal belongings in them.
Tags: Alcatraz, bars, Black and White, California, Canon 20D, cell, irishblogs, painting, Photos, prison, San Francisco, San Francisco Photos, Sigma 10-20, United States
Nice one !
fantastic photograph