A photograph should “work,” should have meaning, in isolation. I suppose that really means that it should work without any context other than shared culture. Without my words, you can know that this is a Japanese Garden (though perhaps not in Oregon), know that it’s an artificial simulacrum of some elegant natural setting—but can the sense of calm in being in that place be conveyed by the image? (I suspect that this aspect might be the easiest to convey.)
At the center of the Nitobe Memorial Garden lies a peaceful pool filled with Koi, and in the middle of that pool lies the “Island of Eternity,” a small island in the shape of a turtle, pictured here.