### Description
This example visualizes the analytical results of Boussinesq's problem from Saada. The figure shows the results by displaying the scaled and oriented principal axes as tensor ellipsoids representing the stress tensor. (These are called *tensor axes*.)

!!! info
    See [Figure 6-22b](/VTKBook/06Chapter6/#Figure%206-22b) in [Chapter 6](/VTKBook/06Chapter6) the [VTK Textbook](/VTKBook/01Chapter1).
