Art for art's sake is a nice sentiment, but even the purest of artists has to eat. So you have to make a little money. But what's the line between artistic credibility and selling out? And does it matter? Those are some of the issues raised in Red, a play by John Logan at the Clarence Brown Theatre in Knoxville. Mark Rothko, a giant of mid-century art, wrestles with his own sense of artistic propriety as he struggles to complete a high-profile commission. Michael Elich plays Rothko, Matt Leisy plays his assistant Ken, and John Sipes is the director of this production.