Wallace Line to the west of the Philippines. Wallace's studies in Indonesia demonstrated the emerging theory of evolution, at about the same time as Joseph Dalton Hooker and Asa Gray published essays also supporting Darwin's hypothesis. Understanding of the biogeography of the region centers on the relationship of ancient sea levels to the continental shelves. Wallace's Line is visible geographically when the continental shelf contours are examined; it can be seen as a deep-water channel that marks the southeastern edge of the Sunda Shelf which links Borneo, Bali, Java, and Sumatra underwater to the mainland of southeastern Asia. Australia is likewise connected
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