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).

Severance' stars Adam Scott, Britt Lower, Zach Cherry, Tramell Tillman and Patricia Arquette all appeared at the New York City station on Tuesday, Jan. 14