"The Other Celia" is a description of "the other," the foreigner, the "alien" who may have come from another planet.

Sturgeon's story has two characters: Slim Walsh, a man who has lost his job due to an injury. Slim has a room that gives him easy access to all the rooms in the house where other tenants live. Slim likes to gossip about what the guests have. He sightsees the entire room, cabinets, desk drawers and bedside tables, and he does not steal; he is just curious about the things people pose or keep.

The second character is Celia Sarton; she is a new tenant. Slim discovers with his voyeuristic investigations through a convenience hole to spy on Celia's private activities. Slim escalates his curiosity and wants to find out more about Celia.
The three images I have created show Slim snooping around the room; likewise, I describe what Celia owns in an image. Her closet is empty, and she uses the doors to dry her "human dress," which wash every night. One image represents the process in which Celia gets dressed in a woman-skin-like "costume" and the face of a "normal" woman. She keeps this "costume" in a briefcase under her bed.