FIELD NOTES: Art in the 18b evaporates galleries close so seeing “869,” an installation by Nima Abkenar, is a welcomed visual shower. It says there is still an experimental spirit in the district with an art designation. A transparent wall allows light to seep in and frames traffic passing by the window. There is space between the scrim and the main medium, a shallow pool of water in the building. The symmetry is thrown off by leftover graffiti, making the tag and the light out of reach. “869" notes how many gallons of water is needed to fill the moat, and shows us how daring the district can still be with an artist and building owner work with each other. Don’t over think it. Just experience it. Watch the water. See the found graffiti reproduced in small stickers. It all fits snugly in downtown Las Vegas. "869" opened November 14. It runs through November 22. The artists reception is November 17. (1319 South Main Street).