Particle Systems Puns

Photo-s-in-the-sys

So he's lecturing about the Schrodinger equations and rotational motion of particles, and how it could be easier to find a solution to the equation if the spherical coordinate system was used. He explains how the system works, and then says while clicking to the next powerpoint slide:

"Let's look at a real world example."

Cue a picture of a satellite image of Earth on the next slide and groans from all of the class.