Anna stood at the center of the strange circle of rock and dust and looked about her, her eyes half-lidded.
"…It looks natural. It looks … well, I imagine that from above it would look like a giant drop of water had fallen from the sky."
"Or that sieve of mine." He narrowed his eyes and crouched a moment, studying the pattern of stones by his feet, then shook his head again.
"Vibrations," he said quietly. "Vibrations deep in the earth."
-Anna and her father, The Book of Ti’ana