Five Stone Square

As you are walking northward down the hill on the sidewalk along Moravian Way Drive, as you pass by in front of Breslau Circle, look east down on the side of the hill behind the corner cottage at Prague Circle and you will see five large boulders, four located at the corners of an imaginary square and one in the center of the square. Is there any reason for this arrangement?

Beyond the stones is the Little Green Shed.