If something has felt increasingly off from the very first reveal of the Mdr office at the beginning of “Severance,” that is entirely by design. But there’s an art to crafting invisible unease — and in maintaining that sense of unease as our understanding of Lumon Industries has changed over the course of the Apple TV+ series’ run.

Supervising sound editor Jacob Ribicoff and re-recording mixer Bob Chefalas own a share of the responsibility for the ineffable presence of Woe, Frolic, Dread, and/or Malice inside the walls of Lumon. It is often their emphasis on specific sound design and foley elements that make small mundanities feel so strange and potentially threatening; differences in how music and dialogue play inside the severed floor versus outside of it also contribute to our sense of claustrophobia or the bewildering openness of the outside world.

So the IndieWire Craft team reached out to...