Art, like beauty, is in the eye of the beholder. So may be the truth, in a legal squabble over when parody becomes rip-off. From one angle, it’s David vs. Goliath, with an independent Austin artist facing legal threats from one of America’s most successful graphic designers. From another, it’s a battle for intellectual property rights, in which a world-renowned creator says a market-manipulating art dealer is passing himself off as an underdog.