There I was standing in an elevator at Queen Mary's Hospital when an elderly woman tottered in and surveying the buttons for the choice of floor declared to the other passengers;"I'm no good at lifts ~ mechanical"
Whilst the lift is indeed moved by mechanical means of gears, cables and counterweights the actual user interface is purely physical/electronic; push the button whose number corresponds to the floor number to which you wish to travel, and wait.
I smiled, I pressed the button for her in an artistic, rather than mechanical, way!
