system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do some mushrooms grow in a "Fairy Ring"? What causes the ring shape?

I see fairy rings in fields all the time but why a circle?
gpt
Because they're all from a single fungal organism. The spore landed at the center of the circle and then grew underground outwards in all directions. So when the fungus sprouts mushrooms above ground, they're all equidistant from the center point and form a circle.