Get a copy of the Dark Side of the Moon DVD. One common theme runing through all of PF music is "Humainty". Roger keeps asking "Is humanity really humane?" This theme keep popping up in just about all of PF albums between 1972 and 1986. Us and Them, Fletcher Memorial Home, The Trial, Dogs and Sheep are all good examples.

During the interview sections on the DVD Roger speaks on this topic and lends some good insights as to whats going on behind the music and what inspires his lyrics. There is also some great insights in the bonus footage on there as well.

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I have always been here.
I have always looked out from behind these eyes.