Paternoster lifts (or a close relative[0]) are sometimes used in warehouses; at a former employer we had two units with X shelves - probably around 20 - each, s

Paternoster lifts (or a close relative[0]) are sometimes used in warehouses; at a former employer we had two units with X shelves - probably around 20 - each, storing a metric shitload of parts. (Each shelf being approx. 1x4m/3.3x13ft) Did sound a bit like the Götterdämmerung while it did its thing, but absurdly efficient space utilization. 0) Close relative as the mechanism is the same, however they tend to only run when a specific storage location is requested, not continuously.)