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A pair of plots showing a three dimensional plot of a saddle surface that goes through the origin and a contour plot of the saddle surface. The contour plot is a two dimensional plot with a pair of intersecting lines from the top left to the bottom right and from the bottom left to the top right going through the origin. The intersecting lines are labeled 0. Three hyperbolas are oriented opening vertically and centered at the origin while being labeled -1, -2, and -3 as they step away from the origin. Three hyperbolas are oriented opening horizontally and centered at the origin while being labeled 1, 2, and 3 as they step away from the origin.