The man in the hooded sweatshirt and cargo pants was not recognizable, but the three letters he was rendering as a 15-foot mural on the wall of a Hell's Kitchen building certainly were: B.N.E. B.N.E. Is Everywhere This mischievous monogram, posted by marker, spray can, roller and especially stickers, has become part of the landscape of New York and cities worldwide, thrilling graffiti admirers and roiling public officials. Its saturation has provoked one of the more enduring Internet mysteries: What and who is B.N.E.?