Hyperbolic Paraboloid

This is the model of a hyperbolic paraboloid. This is often called a saddle graph due to its resemblance to a saddle; it also resembles a Pringles chip. The model is useful to help tangibly demonstrate what the equation of a such a complex shape [z = (y^2/b^2) - (x^2/a^2)] looks like in 3D.