Almost a decade ago, Shane Carruth created “Primer,” a low-budget sci-fi flick that developed a cult following for its complex ambiguity. This new one has a better quality look, arty even. It’s edited with short cuts to keep it moving. But…the plot is totally obtuse. A man and woman have been part of some kind of enigmatic experiment involving a worm. There’s also a guy who walks around recording sounds and tending to pigs. And “Walden.” If you like to feel hip and love to dig deep for meaning, you’re liable to find it perfect. Otherwise, there’s lots of interesting imagery with no easy payoff.