Figure 2.6: Top left: A view of original pyramidal surface in three dimensions. The remaining three figures show the flat norm decomposition for scales λ = 6 (top right), λ = 2 (bottom left), and λ = 0 . 01 (bottom right). See text for further explanation. The images were generated using the package TetView [40]. 48 y x z y x z y x z y x z