I have seen this stencil graffiti several places. It appears to be Queen Elizabeth II in a gas mask? It reminds me of the 'Keep Calm and Carry On' message recently unearthed from World War II. This was on a pillar for a Mopac ramp at Fifth. Soon it will be covered by a random rectangle of neutral paint. I like the abstract paintings the paint overs make...maybe if they used more colors and shapes...oh, wait. What's art and what's vandalism?