The fact that it was appreciated internationally, despite some not knowing the stations behind the anagrams, is a recognition of Harry Beck's iconic Tube map design.
The idea came from The Great Bear, a 1992 artwork by UK artist Simon Patterson on display at Tate Modern in London, but it was not until Dorian Lynskey's music genre tube map appeared in a newspaper in 2006 that Barry Heck decided to make it.
But an online backlash against TFL's lawyers meant that many other websites made mirrors of Geoff's page, thus resulting in more copies of tube map "mash-ups" on the internet.
Because of similarities with Neverwhere it was mentioned in the letters page of author Neil Gaiman's blog, with his fanbase ensuring over 1,700 others linked to it.
Blackwall and Hornchurch stations could not be properly anagrammatized and instead were split into their component words and reversed to produce "Wall Black" and "Church Horn" respectively.