What is the difference between the trackball and turntable style view modes? Blender has two methods for model navigation using the viewport, namely turntable and trackball, with the default being turntable.  When I use trackball instead, I can feel that something is changed, but I can't seem to be able to explain the difference to someone who has never tried it before.  How can I explain, in a technical or non-technical manner, the difference between the two rotation modes?
I'm surprised at the analogy used in the wiki concerning Turntable. This is a turntable for scultping with clay. This lets you rotate around the vertical axis so you can see all sides and judge their proportions accordingly. This is why the mode is called turntable.


(reference, Denise Ferragamo)

Trackball lets you rotate freely around a point in 3D space, this is like picking up the object with your hands and rotating it around until the point of interest is visible.