Ten Examples of the Subway Map Metaphor
The visual components of a subway map make it a great metaphor for grouping and linking ideas or things across many different conceptual realms. We’ve collected here ten excellent examples of the subway map metaphor.
1. Milky Way
The Milky Way Transit Authority shows the spiral of the galaxy, with major constellations and nebula appearing as transit stations. Perhaps unsuitable for navigating an FTL-enabled spacecraft, but it serves well for orienting terrestrial astronomers.

The Milky Way Galaxy
2. People
We are surprised to see Leonardo da Vinci at the intersection of the Comedians and Italian Artists lines in Simon Patteron’s otherwise wonderful Great Bear map of famous people.

Famous People
3. Music
Different genres of music are represented by different transit lines in Dorian Lynskey’s map, with bands and musicians appearing as transit stations. Björk is well-placed at the intersection of Pop, British Folk, Jazz, and Avant-garde. (thanks to Paul Lamere)

Musicians
4. Publishing Trends
In this map of publishing trends, Soybits diagrams the connections of people, formats, and products involved in the publishing industry. The Kindle, iPhone, and Android platforms form major intersections.

Publishing Trends
5. O’Reilly Books on Open Source
The O’Reilly books are known for covering a wide range of technologies and programming languages. This map diagrams the relationships among books on open-source technology.

O'Reilly books about open-source technologies
6. Web trends
As we mentioned in an earlier post, this subway map of the web by Information Architects is a fascinating exploration of popular Internet sites.

Web Trends Startpage shows websites as if they were the Tokyo subway
7. CMS Vendors
CMSWatch has published a diagram of popular content management technologies.

Content technology vendors
8. Subway map of world subway maps
Penguin’s book on Transit Maps of the World features a map of subway systems around the world. While the connections between cities seem somewhat arbitrary, we appreciate the style and spirit of this map.

Transit map of world transit maps
9. Cancer pathways
From Jonathan Stott’s thesis, Automatic Layout of Transit Maps, which we discussed previously.

Visualizing cancer pathways (Hahn and Weisberg, designed by Claudia Bentley)
10. Project plan
From Jonathan Stott’s thesis, Automatic Layout of Transit Maps, which we discussed previously.

Project plan
Bonus: Gotham City
Gotham City Rail has published their transit map. Wayne Central is, as expected, at the heart of the city.

Gotham City transit map
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I love art based on the design styles of metro maps. Found another one here to add to your list – it’s a World Metro Map, though unlike the one from the Penguin book, isn’t based on existing transit systems, but appears to be a view of what a world metro map might look like, if the world’s cities were connected by a metro system.
It can be seen here: http://worldmetromap.blogspot.com/