civil rights movement. >> brown: above all, says martin, who sometimes worked with his father, he was an artist who documented what he saw. frank espadalished a book in 2006 titled "the puerto rican diaspora: themes in the survival of a people," and his photographic work has been collected by the smithsonian american art museum where martin and i met recently. >> i remember this one. this was a photograph that was taken in hartford and i remember >> at first glance, this appears to be a photograph of three kids on the street and, indeed, it is hat. but if you look more closely to the right you'll see a notice for a foreclosure sale on those premises. and that is very much a part of what my father is saying in that photograph. >> brown: in a poem titled "mad love," martin espada refers to specific photographs, as a way of addressing what his father will no longer see. >> a beret, grinning at the vision of shoes for all the shoeless people on the earth; not the dancer hearing the piano tell her to spin and spin again not the gravedigger and his machete, the bandanna that keeps the dust. not the union organizer, spirits floating in the s