The design team devised a palette of materials that becomes progressively cleaner and lighter as it ascends the building, suggesting an atmospheric journey from earth to sky. On the ground and first floors, the walls are panelled with a 3D-printed material made from recycled drinks cartons, developed in partnership with Amsterdam-based Aectual, which gives an earthy colour and a fluted texture to the walls. Meanwhile the floors are made from Duracryl’s Durabella, a sustainable terrazzo flooring made with renewable resources. On the level above, the walls and floors are finished with wood, while on the third floor, wood floors are complemented with eco-friendly paint. The fourth floor features a peachy orange gradient on its walls, which draw attention upwards to the vaulted ceilings of the original building.