Hornby Nipple Jesus

I dont really understand what is this reading about. Its kind of hard to find the main idea in this 15 pages story.

I think the writer first talk about think about his life and his job. Then he talk about a experience in a gallery. People's reaction about a picture.

I try to figure out what this reading about. The different people can have different responding to the same stuffy. And for a perosn, he even can have different thinking about the same thing because of his changment.

My qeustion is about How and  what relation the writer made himself and the painting. And what he really wanna to say in this story. I felt the story is kind of sepreated and doesnt have a mian idea.