I don't remember WHICH of the four podcasts it was on, WHO wrote it, WHAT the title was, or WHEN it was posted, so I CLEARLY remember this story extremely well.
It was either an ekphrasis or something similar....discussing the works of an artist over time, or a specific work...it seems like the painting(s) being discussed revealed truths about the artist, and that was the point of the story.
Ring any bells?