I'm trying to find a short story about a writer who has his fiction analyzed by a computer and it tells him the main theme of his work is sludge (or grease or grime or etc.). He's surprised and upset by this. I don't think there was any conventional action, most of the story was back and forth between the writer and the computer operator, or the writer thinking about the results of the analysis, so there weren't other details to remember...
I'm less confident about these details, but:
- I read the whole story online somewhere, on a normal (maybe academic?) web page
- it was originally published in a collection of short stories about computers
- the cover of the collection was a 90s clip art style illustration of a man getting on an airplane