Richard Serra made steel move and bend. He made rooms and museum halls, which seem almost like insurmountable obstacles for transformation, into reconsidered, powerful, sculptural spaces. We know steel to create massive buildings, bridges and spaces we live, work and commute upon, but Serra made steel expand our idea of structure and form, of time and place. His drawings, too, perhaps some of my favorite works of his, and for which I met the man at a retrospective of his drawings at SFMOMA in 2011, were also explorations of how to occupy, free and understand space and limitations.