The pop-up began when a large glass box appeared in Grand Central's Vanderbilt Hall, containing a replica of the four-seated desk from Lumon's Macrodata Refinement department. Hired actors playing Lumon employees sat at their desks, doing Lumon things (by which I mean, sorting numbers while not having a clue what said numbers mean).

Grand Central Station in New York City, New York, US Video Recording Date/Time: January 14, 2025 The cast of the television series Severance appeared at New York City’s Grand Central on Tuesday, January 14,

Adam Scott, Britt Lower, Zach Cherry, Patricia Arquette and Tramell Tillman all appeared as their 'Severance' characters for the pop-up. Ben Stiller was on hand for pictures.