Rees nodded approvingly. Good question. “Yes, we do. There are ways of making the roof transparent — in fact, we can opaque the floor, if we want to.” He glanced at the instrument’s fist-sized status panel. “We’re in luck; there are no observations currently running. I’ll give you a quick guided tour of the Nebula. You should know most of what I’ll tell you from your studies so far, and don’t worry about the details for now...” Slowly he punched a sequence of commands into the keypad mounted below the sensor. He became aware that the lad was watching him curiously. Maybe he’s never seen anyone with such rusty keyboard skills, Rees reflected, here on this Raft of a hundred supply machines—
-Raft, Ch. 6