Summary: Rose can't get her head around the TARDIS.
“How can you have a garden in a spaceship?” Rose had seen a lot of weirdness since meeting the Doctor, but this beat everything. She’d managed to adjust to the TARDIS being bigger on the inside, couldn’t get her head around it but she could accept it. This though…
“Same way I can have a library, and a swimming pool, and everything else; it’s in another dimension.”
“But it has sky, and clouds, and rain!”
“That’s because it’s outside.”
“But how can it be inside and outside at the same time?”
The Doctor grinned. “Time Lord technology. Brilliant, isn’t it?”