Warby Parker offered a sneak peek at its South Congress facilities opening Saturday. About double the size of its other retail locations, it's the eyewear company's first permanent store in Austin. Another store is set to open at The Domain this fall. In addition to eyeglass frames and sunglasses, the store sells a small collection of books. The space also features a patio, photo booth and a writing center. The latter is the soon-to-be home of local nonprofit Austin Bat Cave, which helps children age 6-18 develop their writing skills.