Grief can appear in a number of ways. Anger, revenge, depression... The Doctor could feel each stab of emotion with every turn of the dial. He'd push a button, and suddenly her face would appear, perfect and timeless.

But with darkness, comes light. He treasured her memory – smiling, laughing, teasing. They were things even his old body couldn't live without. With them, the Doctor found the strength to smile as he pulled the last lever.

Grief takes many forms, the Doctor thought as he opened the TARDIS doors and admired the newly-created Rose Galaxy. And one of them is beauty.