I've never been a fan of bumper stickers, though I’ve always thought the idea had potential. Done right, you’d think a bumper sticker could be a sort of ideological haiku, an elegant little distillation of a person’s unique perception of the world. Or, alternatively, that it could express genuine wit by being a joke that doesn’t take too long to tell. And even if a bumper sticker isn’t very likely to prompt people to act, it should at least make them imagine. As in, for example, “Visualize Whirled Peas.”