<p>When folks from the upcoming Obama Presidential Center call with a once-in-a-lifetime opportunity to display your art, you figure out how to get it done. </p><p>Artists Sam Kirk and Dorian Sylvain were asked to team up on a mural in the center's basketball court, and collaboration came easily. It helps when you're friends whose work complements each other, and together you can navigate the security and privacy requirements that come with creating a piece for the former president.