Photolog pt. IX - Paternoster Picture

Thanks to my sister and her boyfriend I recently had the opportunity to use a paternoster elevator. You know, one of these lifts with a constantly moving vertical chain of small boxes.
I know it's not a very original question, but I wanted to know what happens at the very top, and of course the small boxes don't go upside down but are translated over the "hairpin bend" by a giant noisy gearwheel. What a classy fun -- especially with this sign shortly before ("last floor - continuation safe").