It’s as if the tumor of hipster culture that formed when the cool kids moved to Williamsburg had metastasized into a cluster of cysts pressing down on parts of the borough’s brain. Around the militantly organic Park Slope Co-op, for example, or Brooklyn Flea in Fort Greene, where you can buy rings glued to typewriter keys as well as used, handmade, vegetable-dyed, vintage Oriental rugs for $1,000. Brooklyn is producing and consuming more of its own culture than ever before, giving rise to a sense of Brooklyn exceptionalism and a set of affectations that’s making the borough look more and more like Portland, Oregon.