Wallace Line by the Sahul Shelf to New Guinea. The biogeographic boundary known as Lydekker's Line, which separates the eastern edge of Wallacea from the Australian region, has a similar origin to the Wallace line. During ice age glacial advances, when the , both Asia and Australia were united with what are now islands on their respective continental shelves as continuous land masses, but the deep water between those two large continental shelf areas was, for over 50 million years, a barrier that kept the flora and fauna of Australia separated from those of Asia. Wallacea consists of islands that were not
Arts on the Line the approval of the artist's widow. 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