Looking inside a paper shredder.

The shredder,

The motor,

The switch (reverse, stop, forward),

Gears,

For more epic teardowns, where they actually explain what you are looking at and how it works, checkout awesome YouTube channels like EEVBlog and Mike’s Electric Stuff. They take apart and sometimes repair epic things like flight recorders, defibrillators, X-Ray machines, POS pin pads, photocopiers, and phonebooths.