Perhaps it's not clear I've been facetious...I'm aware that the topic got derelailed by Richardson in person and his Yashica, but still...what the frak are they talking about? Art, commerce and porn are the same thing, everybody knows it!
Are these shots artistic, professional, commercial or pornographic?
To be equally snarky, it could be argued that they are none of the above, but instead are mere snapshots taken without any intent whatsoever. They could be artistic (photographed with intent to communicate, not just document), they could be commercial (taken for advertising purposes). I seriously doubt they would qualify as pornographic to any but the most thoroughly degenerate mind stricken with industriomania (the eroticization of public infrastructure and industrial buildings). But generally, not pornographic as there's nary a penis nor boob in sight.