Joanne Greenbaum never waits for thunderbolts. The 60-year-old New Yorker regularly just sets to work instead, trusting that if she keeps adding layers to her various canvases in progress, the resulting images will argue for themselves. Her latest abstract series may be her most effective yet. Each painting hits the eye like a storm, often combining network-like lines, bold color fields, frantic scribbling, and dripping stains to spread energy across all 90 by 80 inches. This is process painting that hints at a mechanical origin but conveys an unbridled life force, like big-screen blueprints that have been pollinated by several garden species all at once. At Rachel Uffner Gallery, 170 Suffolk St., New York City, (212) 274-0064. Paintings are priced at $55,000 each.