This has the stench of Academy of Art student project emanating from it, but...who knows? An SFist reader (hillary's_quivering_lip) sent it in to us, taken at Montgomery and Sacramento. It's been posted there for a week, and said reader did not look up quietly.
Update: The addendum reads: "I really tried for a minute but my neck hurts and I'm
pretty sure my eyes are playing tricks on me. thank you though. x o" Ta-da.