Jenny Holzer shines new light in dark places.

Thirty-five years after setting the Guggenheim's rotunda ablaze with an electronic text racing along its spiral ramp, Jenny Holzer is reprising the installation. Her advice to viewers has remained the same: just read the art. The targets of the texts written in the late 1970s and 2001 range broadly. She keeps a viselike grip on threats to democracy in the newer, non-electronic work in this exhibition. During a recent conversation at her Brooklyn studio, where one work after another bore witness to extrajudicial incarceration, "enhanced interrogation" and other governmental malfeasance, she conceded thatOptimism is not her specialty. Her question is how to represent lethal conflict in the United States and abroad. A Midwesterner by birth, she is self-deprecating, plain-spoken and armed with a wicked gift for irony.