There’s always something new to be found in the TARDIS, tucked away in some forgotten room, or more likely something old that’s been there for centuries. After so many lifetimes and so many regenerations it’s only to be expected. Live in one place for long enough, even in a time and spaceship, and stuff accumulates. Happens to everybody.
One wrong turn was all it took to rediscover something long since lost, pile upon pile of balls and skeins of yarn in every colour imaginable.
The Doctor smiles. Maybe it’s time she took up knitting again; she could use a scarf.