An example is the layout of the players’ starship. Think about the Millennium Falcon: you’ve seen the cockpit, the lounge, and the gun turrets which are linked by a central tube so the gunners can shout to each other. And some curving corridors. But what else is there? How many staterooms does it have? How big is the cargo hold? What does the engine-room look like – is there even an engine-room, or does maintenance depend on crawling through access tubes, or even going outside and opening hatches?