Motion of a rigid plate across the surface of the Earth 

geosciences3d.univ-lyon1.fr
This video illustrates the Euler's theorem, which is central to the theory of plate tectonics. Indeed, Euler's theorem is used to describe the velocity at any point of a rigid plate in motion at the surface of a sphere.
Using 3D allows here to illustrate efficiently, unlike 2D projections, this theorem of spherical geometry, which has played a crucial role in the establishment of a fundamental theory in modern geosciences.