German visual artist Anne Imhof and a cast of more than 40 took over the Park Avenue Armory March 3-12 with a sprawling three-hour immersive performance piece called Doom: House of Hope. Immersive meaning you’re on your feet the whole time, stuff happening all over the gigantic Drill Hall and in the small dressing room/galleries along the south wall, no fixed focus, some scenes filmed and projected onto four Jumbotron-like screens but other scenes visible only if you happen to be standing nearby.