Seriously long Lego system.

[DonRotolo]

Really, who has time for that kind of thing?

Anyway, this is a good lesson in process capacity control: Notice that no part of the system is faster than any other part of the system, so you don't get a bottleneck anywhere. In fact, watch the mechanism at 4:22 - any overflow for the "slow" lower process is diverted to a simple rail up higher.

Now imagine having a job doing just that?

Not with Legos, of course, but for a production line for, say, a car. Everything has to line up just right, time-wise.

Plus a fascinating look at many different materials handling techniques.