I'm reminded of a similarly circular phenomenon, known as "fairy ring," where mushrooms grow in a circle. They appeared on our lawn in Saskatchewan from time to

I'm reminded of a similarly circular phenomenon, known as "fairy ring," where mushrooms grow in a circle. They appeared on our lawn in Saskatchewan from time to time; apparently it happens all over the world. http://en.wikipedia.org/wiki/Fairy_ring http://en.wikipedia.org/wiki/Fairy_ring