“Beautiful Steps #2” by L/B (2009)
Sabina Lang and Daniel Baumann’s collective “L/B” is focused on architectural interventions that reconsider notions of perspective, function, and beauty. “Beautiful Steps #2” is a part of their “Beautiful Steps” series in which they build staircases in non-traditional locations. In this example, they have created a quasi-functional staircase on a skyscraper, utilizing the forced perspective of the building’s architecture to enhance their own work.
More here.