Many people think "a stone is a stone is a stone is a...". Not so. Walking more or less the same roads many times a week, one discovers that each wall, each stone in the wall, each pattern of laying them, has its own story to tell. And the story varies with the lighting, the weather, the time of year, etc etc.
Many have been carefully placed. One can imagine the hobby-mason having fun when designing his creation. Maybe he thinks: "I wonder what they make of this?".
Here are a couple of examples:
The top one is taken in the morning with the light coming in from the left, enhancing the natural contrast, and showing the fine natural pattern in both stone, concrete and moss.
In the second one, it is almost possible to hear the cry: "Hey - I'm not a square!"
STOP OVER -- REDLANDS, CALIFORNIA
3 hours ago