These are a friends photos, he didn't say if they were his work within the photo or not, but he did make a note to me about this persons work. first photo(the staircase)went up one year before the rest of them, a year break dale9th took to refine his weak skillz into siq ones. As for the rest of them, they've appeared in the past few weeks, amongst numerous tags to and from these spots-as well as other random locations. the final one was within the past 48 hours. if you're interested in viewing the progression of this artist, feel free to pm me. no cops allowed.