Trust the rust! The owners of the Celentano Residence in New Jersey wanted a new external staircase that matched the design of the house, so their architect Brandes Maselli took their cue from the building's COR-TEN steel cladding, which is supposed to rust. And they commissioned EeStairs to make and install a spiral feature staircase with perfectly curved COR-TEN balustrades. Rust + geometry = style.