Well I'd rather listen to people's first reactions to these pictures rather than to my own voice, but I'll try anyway..
The first one's the most obvious. That homeless guy was walking down the train station, and I found it rather ironic that he was surrounded by looking to get out of their houses when he doesn't have one.
My favorite's probably the last one, I like the contrast between the fluidity of water against the hardness of concrete and steel.