Using the principle that tube maps distort reality, can you apply a bit of mental manipulation to determine which tube lines are represented by each of these diagrams?
The pictures are well worth a look even if you don't participate in the quiz :-)
Answers in the comments to his post.
[EDIT 2006-10-25 00:03: Diamond Geezer has pointed out in the comments to this post that including his image directly in my post is probably a little impolite. I've removed it but urge you to look at his post anyway... it's rather cool]