A personal challenge to write tell a story in 100 words which, I think, speaks for itself.
"You see, Jamie, the universe is vast. There are more stars than there are blades of grass in a field. From far away they seem identical, but look closely and each one is unique. Nothing is ever still, it's all turning and falling all the time. And in the TARDIS, space and time aren't separate, they are the same, and you must walk a narrow path through both to a place that lasts as long as an eye-blink as everything that ever was rushes past you."
"Aye? And that's why you can never land in the right place is it?"