Drivers under the North Lamar railroad-bridge underpass wonder at the rectangular-blue panels that stick out of the retaining walls. Are they flooding indicators? Caution signs? No, they're the last remaining pieces of an installation called “Moments,” which originally included painted squares and solar-powered lights on the walls. The other elements fell victim to vandalism and construction, so now just the panels remain. They've been one of the most visible targets for yarn-bombing in Austin, and reflect a blue glow from motorists' headlights at night—but most residents take them for unusual signage.