Find a row things seen from an angle. Focus on an obvious point somewhere near the middle and take thefirst picture with the lens at its widest aperture. Take the second with the lens stopped down to the mid-point of its scale of numbers. Take the third with the lens at its smallest aperture.
The point of focus for these 3 images was the shrub second from left. I can see that the first (closest) shrub is at its most sharp in the first image and becomes softer in images 2 and 3. However, I cannot see a clearly defined area of sharpness in any of the images.
What have I learned?
This has taught me that in order to achieve a specific visual effect, it's not just about the camera settings, but the choice of subject as well.