A twisting set of floating copper staircases intertwine at the main entrance of Copenhagen’s new science and technology center, the Experimentarium. The museum, and its four-story Helix staircases, were designed by Danish architecture studio CEBRA who wanted to create a subtle nod to the institution’s science-based curriculum. The design is an abstract version of a DNA strand’s composition at an extraordinary scale. At over 300 feet long, the staircase includes 20,000 pounds of copper and…