One for the music lovers here, Phil pointed me to a Guardian article about how they tried to tie each line of the classic London Tube map to a genre of music and then rename each of the stations with an appropriate artist. One of my favourite pieces of art is Simon Patterson’s The Great Bear where he does something similar (I’ve actually got a print of it  on the wall in my lounge), but this is actually more impressive as all of the intersection stations actually seem to work. You could spend hours reading this.