Under the Radar: Techne at BAM

New York Theater: “Techne,” one of the shows that opened the 20th anniversary “Under the Radar” festival this weekend, reinforces its reputation for theater so experimental it makes you wonder what theater is. Comprised of a series of four “digital artworks” that will unfold over the next two weeks at BAM Fisher, “Techne” begins with “The Vivid Unknown,” which the program describes as an “AI driven immersive installation.”