Royal College of Art graduate, Elena Larriba, designed "Vycle", a bicycle-inspired vertical transportation system that aims to disrupt the 'elevator or stairs' dilemma by adding a third choice to it. Elevators require a lot of energy to transfer people from one floor to another, whereas stairs are taking too much space and can be exhausting.
Of course, the creators of this project do not wish to replace neither elevators nor stairs with this invention, but rather to add an alternative way of vertical transportation similar to what regular bicycles are in relation to walking and driving a car. This is still a working prototype and has to undergo more research before it becomes completely safe and feasible, but "Vycle" team claims their system could work great with temporary installations such as scaffolding and could possibly be a good way of transferring between a small number of floors within a larger building. You can follow "Vycle's" progress by visiting their Twitter and Instagram accounts.