The DC Metro map reimagined as a spiral. It was really quite fortunate that all the lines & stations fit together such that this was even feasible. Even more: I could alternate between hot and cold colors to help maintain contrast.
It's prompted great response & interpretations, largely what constitutes a "map". My two cents: a map is something you can use to get from point A to point B... it doesn't have to be efficient, so long as all the information is there. It doesn't even have to be geographical: it could be a mapped out strategy for any variety of things. But in the geographic sense: this map has all that you need to navigate the system. My opinion is that it is a map... it's just not a good one.