In a hip-hop crowd, you might miss Paul Richter — a skinny bespectacled kid in a giant sweatshirt, hood up. But onstage, as pWrecks, he delivers something completely unexpected: rap that sounds like beat poetry, words that sound like science fiction, ideas that are apocalyptic. He quotes Philip K. Dick. He preaches individuality. He wags a finger and reminds us of karma. If you like hip-hop that’s good for your brain, be there for p.Wrecks’ set.