||Tate Britain - Spiral Staircase, Green Park - Escalator Array, Tate Britain - Deep Staircase. Stairs can be used to walk up or down different levels. They can be different shapes and forms. Spiral staircases look elegant and save space. Stairs that are deeper have a much more shallower gradient, so they take up more space than a steeper set of stairs. Stairs can be automated, such as on an escalator, where step segments are on a loop and they rotate around, you can can stand still while still going up. I like how the escalator array has a staircase in the centre as it gives you the option to walk. Usually on escalators, one side is for standing still, while the other side is for walking, for those in a rush.