These days, a conveyor belt can be so much more than a belt. Omnidirectional belts are programmable, allowing items to be rotated, aligned, and even transferred to other belts as they zip along.
Here's a peppy little montage:
This one is in German, but it has lots of great closeups of the casters and how they can move independently or in unison.
Head over to the Intralox channel for lots of other cool vids, like food washing belts, can labeling belts, and all kinds of other sorting options. Very satisfying!