Assisted by museum staff and volunteers, Serra made the piece by hurling molten lead into the corner of a room, letting it harden and then prying it loose and upending it on the floor. (sfchronicle.com)
For the show, Richard Serra flung 460 pounds of molten lead against the walls, while Lawrence Weiner removed a section of the wall, and Michael Heizer smashed the street in front of the museum with a wrecking ball. (hyperallergic.com)
Like Robert Morris, on the other hand, Richard Serra made his work by experimenting with materials; for example, he threw molten lead into the corners of a room, or he cut, propped or stacked lead sheets, rough timber, etc. in order to create large, strangely balanced structures. (widewalls.ch)