i used glassphalt, a mix of asphalt and recyclable glass bits that catch and reflect the light.t's symbolic of the public's power to turn things around, to bring life back to a place of decay. feldman: underlying all of this is her understanding of the history of art. many artists have made beautiful artworks dealing with materials that would be discarded. she starts with the lowest base level, our refuse, and builds beautiful artworks from that, and that's absolutely essential. it's been going on for centuries, and she just steps in and does it exactly where it matters most. ukeles: my work is about transformations. my artwork grows out of real systems, out of the place itself. but beyond revealing the system and the space, my work reimagines them. then, it's not only the place itself that changes, it's also how we see the place that changes. so, it's us that changes, our attitudes about the land and how we use it. doherty: fresh kills landfill -- the total acreage is about 3,000 acres. it's four landfills in one. there's four mounds out there. two of them have been closed with