Caret 6, by architect Kory Bieg of OTA+ and his UTSOA design studio, was inspired by the lines of ribbed Gothic vaults and made of thousands of diamond-shaped, CNC-fabricated pieces of sheet steel. Austin’s South by Southwest (SXSW) festival—a week or so of music, film, and interactive events that draws thousands of visitors—has experienced ever-expanding scope creep since its small, loud beginnings in 1987. This year, architects got in the game, engaging the high-energy crowds with two noteworthy installations and one pop-up.   One, Waller Wall, was installed on the outdoor terrace of SXSW Create—a portion of the SXSW Interactive festival