        “It might be for something else.  Maybe she’s just amusing herself at our expense.”  At the sharp look from Twilight, Lyra continued.  “I mean, when I spent my first day with my maestro, she took me to her rock garden.  Have you ever seen a Neighponese rock garden?”  Twilight shook her head.  “Many of them are quite beautiful.  Hers had a single dark rock in the center—looked like obsidian—with the pattern extending outward in a widening spiral, almost as if they were ripples caused by the large rock falling.  She asked me to spend an afternoon studying the obsidian.