Wallace Line connected islands on the west (Sumatra, Java, etc.) with the Asian continent and with similar wildlife, and islands on the east such as New Guinea were connected to Australia and were characterised by the presence of marsupials. Wallace used his extensive travel in the region to propose a line to the east of Bali since "all the islands eastward of Borneo and Java formed part of an Australian or Pacific Continent, from which they were separated." The name 'Wallace's Line' was first used by Thomas Huxley in an 1868 paper to the Zoological Society of London, but showed the line
Where Is the Line "assault[s] the listener with a hail of vocal gunfire". Heather Phares of AllMusic commented that the track was one of herBjörk's "tough, no-nonsense songs", and "Rahzel's hard-hitting beats make it starker than anything on "Homogenic"". The music video for "Where Is the Line" was directed by Icelandic artist Gabríela Friðriksdóttir and shot at a stable in Iceland, in November 2004. It was premiered during Friðriksdóttir's exposition at the Venice Biennale in 2005. Originally being one of three films from the artist's "Versations Tetralogia", then edited to fit "Where Is The Line". It shows Björk wearing a dress made of sandbags