Usually any sort of image that you see around you is in one piece. Pictures of a hamburger behind the counter in Macdonalds, for instance, are in one piece. They don't show the left half on the hamburger on one panel and the right half of the hamburger on the other panel. They don't even show the bun on one panel and the patty on the other panel.
I could only think of one kind of image that is commonly drawn on several — four, in this case — separate panels. I wondered whether it was possible to convert any painting that I know of into a four-panelled polyptych and if so, what the result would be.
Suddenly it dawned on me. Here is the result.
Click the image for a larger version.
5 May 2019. Today I visited the café where I saw the two-panel painting of the heron and the rabbit. I regret that the painting is no longer on show there.