Imagination.

PS.

My Tumblr (everything that's beautiful): somethingverybeautiful.tumblr.com/

My other Tumblr (pictures of the universe only): galaxypictures.tumblr.com/

My third Tumblr (beautiful places around the world): whyaminothere.tumblr.com/

Just for fun, none of them have my own pictures.. except the first, but that's rare.