Where the figure is fore-shortened, there ought to appear a greater number of folds, than on the other parts, all surrounding it in a circular manner. Let E be the situation of the eye. M N will have the middle of every circular fold successively removed farther from its outline, in proportion as it is more distant from the eye. In M O of the other figure the outlines of these circular folds will appear almost straight, because it is situated opposite the eye; but in P and Q quite the contrary, as in N and M.