Elevator that has no doors and won't stop

A paternoster or paternoster lift is a passenger elevator which consists of a chain of open compartments (each usually designed for two persons) that move slowly in a loop up and down inside a building without stopping. Passengers can step on or off at any floor they like. The same technique is also used for filing cabinets to store great amounts of (paper) documents or for small spare parts. As a result of safety issues, many such lifts have been shut down, however a small few survive around the world, the largest of these located in the Arts Tower at the University of Sheffield, which also remains the tallest university owned building in the UK.