Here’s a picture of “Ken Rock,” a.k.a., artist Ken Hiratsuka, who we met at an open studio reception in Brooklyn last night. Ken is something of an underground art legend in New York. His work is literally part of the city — he’s famous for his sculptural carvings in the old stone slabs of NYC sidewalks, especially downtown. One of his best known works can be found at the corner of Prince and Broadway streets in the heart of of SoHo.