The painted "V" on the apartment doors contribute to the plot throughout the story in that is draws the reader to consider the two parallel meanings discussed "Vacant" or "Virus". This story is a short one titled "Recognition".
The short story "Recognition" examines the subject or theme of death. It does this be looking at the various ways in which people lived their lives before.
In this story, the protagonist is unnamed. The "V" is sued to reference "Virus" and "Vacant" rooms.
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