The Nova Scotian's on the corner apparently found a little Poodle Poop on their lot. Instead of bending over and picking it up, they went out of their way to find 5 white rocks and surround it as thus.
My friend that lives across the street said that they were waiting for people to ask them why. She told them it might just attract unwanted attention and they'd find more poop. Sure enough, a few days later when I walked by, I saw that instead of 1 circle of rocks, they had set up 8-10 circles. Each with exactly 5 rocks around the offensive Poop.