Alias draws CVs differently to let you tell the difference between the start and the end of a curve. The first CV (at the start point of the curve) is drawn as a box. The second CV is drawn as a small "U" to show the increasing U dimension from the start point. All other CVs are drawn as small Xs. The first two CVs and the last two CVs define the tangential direction of the start and end of the curve respectively.
