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
Arts on the Line Arts on the Line Arts on the Line was a program devised to bring art into the Massachusetts Bay Transportation Authority (MBTA)'s subway stations in the late 1970s and early 1980s. Arts on the Line was the first program of its kind in the United States and became the model for similar drives for art across the country. The first twenty artworks were completed in 1985 with a total cost of , or one half of one percent of the total construction cost of the Red Line Northwest Extension, of which they were a part. After the first 20 artworks