Over the past week, a swarm of local and international artists have been working in parks and vacant lots in West Palm Beach, transforming the spaces into a giant outdoor museum. It's part of a larger strategy by the city’s planners that goes beyond aesthetics. “I came out here to install a 25-foot metal paper airplane.” said Los Angeles-based welder Griffin Loop. “It’s based around the message of setting intention to launching it into action.” Loop is 6’2” and around 190 pounds, clad in black skinny jeans and a black t-shirt. And he was climbing all over his steel creation Thursday like a finicky mountain goat -- polishing edges to a lustrous shine, making sure all the panels reflect the South Florida sun just so. His sculpture is a two-ton metal version of a paper airplane you may have folded in class. He’s installing it in a grassy patch of Jose Marti park near the corner of Flagler Drive and 2nd Street in downtown West Palm Beach. About two miles to the north, local painter Ron