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
Line of beauty with straight lines, parallel lines, or right-angled intersecting lines, which signify stasis, death, or inanimate objects. In contrast to grand compositional lines, which are regularly found in Baroque or Rococo art, the serpentine line is not primarily dictating the whole composition of a canvas. Instead, the line should be understood as being found in parts; a composition is created by employing various kinds of lines in various relations to each other without destroying its simplicity. Line of beauty Line of beauty is a term and a theory in art or aesthetics used to describe an S-shaped curved line (a serpentine