The Endless Stair is a public art installation created by architecture firm DRMM in collaboration with the American Hardwood Export Council and engineering firm Arup for London Design Festival 2013. The designer combined fifteen staircases to create an Escher-style installation outside Tate Modern. The designer said: “Stairs are always the most interesting things about architecture, they’re places where people meet”.
It is a mystery stairs, visitors can climb up, down, over and under the structure, with stairs leading from one to another to dead ends. Steps and balustrades are made from cross-laminated timber panels of tulip wood, hand rails are formed by overlapped vertical panels to look like treads turned on their side for optical illusion.