My friend Simon is a public artist, designing projects around the country that incorporate elements of light, color, sculpture, whimsy, magic. His "rattlesnake bridge" has become one of Tucson's recognizable icons, one I delight in seeing on each visit to that Southwestern town. So when he asked me if I'd like to accompany him to the foundry that was manufacturing the models for his latest project, I jumped at the chance. Warned not to pet the resident German Shepherd, I happily complied. But what was I to make of this sign that greeted us at the foundry's front door?