The Key of Questions   In the dusty attic of her grandmother’s house in Mirai, Lena found the door. It wasn’t hidden behind a curtain or a stack of trunks; it was simply there, woven into the wall, its surface a mosaic of shifting, polished stones. At its center was a single, carved handprint and an inscription: “Knock with curiosity, enter with understanding.”Lena, ever practical, knocked. The stones shimmered, and a voice, smooth as river stone, echoed in the quiet air.“I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?”Lena