'Staircase-III' is one of a number of works Suh has made based on his personal memories of architectural spaces, both of his parents' traditional Korean house in Seoul and his own Western-style apartment in New York. A gauzy red staircase floats high up in a gallery at Tate Modern, in this installation by artist Do Ho Suh. Watching as the team pinned the fabric in place, he told us about his inspiration.