The artist who painting a big yellow “CAUTION: Low flying planes” on the side of a building in Lower Manhattan says he didn’t mean to offend his neighbors who are now complaining. “His 10-by-14-foot painting, he says, is about the terrorist threat. ‘It’s still out there. . . . [The painting is] a statement saying it’s not over’.” One resident is surprised by the negative reaction: “If that was a Tommy Hilfiger ad, nobody would be complaining. . . . If it was a 12-year-old with too much lipstick on, that would have been all right. But this is not?”