But as you know, the most important reason for going from one place to another is to see what's in between.
'How can you see something that isn't there?' yawned the Humbug, who wasn't fully awake yet. 'Sometimes it's much simpler than seeing things that are,' he said. 'For instance, if something is there, you can only see it with your eyes open, but if it isn't there, you can just as easily see it with your eyes closed.'