This is something I wonder about. I keep an eye out fro this, lucid dreaming or not.

How detailed are your dreams? Do things have textures? Does the sun feel hot? Are there stars in the night sky? If, walking through a city, you were to stop and enter a randon shop, would it be filled with things like in real life, or bare? What about other people? Do you see the other people in the city, going about their lives, or is it just you and whoever you're specifically dreaming about?

Do you feel pain, see colors, listen to music? What about books, if you opened up a book in some random dream store, would there be words inside?

Actually, dreaming books really interests me. What would they be about? O.O
I dreamed one once, and I remember it told me something that was going to happen, but I couldn't remember when I woke up.
I sometimes dream that I'm looking through beautiful paintings I've done, trying desperately to memorize them, so I can really paint them when I wake up.