Probably not invited.
This Swoon drawing is attached to a wall just outside the commercial galleries on West 22 Street.
UPDATE: I've received a comment from Adrian that the work is not that of Swoon, but either Elbowtoe or Armstock. Can anyone confirm which it might be?
That is not Swoon its Elbowtoe or Armstock.
oops.
Does anyone know for sure, and could I find a link as well?