An interactive application for plotting implicitly defined curves. Comes with some online documentation. (FAT binary runs on NeXTSTEP 3.x Motorola, Intel and HP PA-RISC.) Part of the mission of the Geometry Center is to develop software tools to support the computation and visualization of mathematics. A considerable portion of the Center’s efforts have gone to designing such tools, and to making them available to the mathematical and scientific communities, and to the world at large.